# Safe combination 404 > A steel safe with a dial you turn by dragging or with the arrow keys; enter 4, 0, 4 and the door swings open. - Category: [404](https://library.aimran.es/components/404) - Built with: HTML + CSS - Live editor: https://library.aimran.es/blocks/404-safe - Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham ## Where to use it This error page is a small puzzle: a gunmetal safe with hinges, rivets and a knurled combination dial. You turn the dial by dragging it in a circle or with the arrow keys, press the brass button to enter each number, and the code 4, 0, 4 swings the door open onto an empty shelf. The dial is an accessible slider with its current value, wrong codes shake the door and light a red LED, and the hint sits right under the safe. Change the amber accent and send the button to your home page. ## Code ### HTML ```html 404 · Page not found

Combination: 4 · 0 · 4

We opened the safe and there's nothing inside.

The page you're looking for wasn't kept in here. Try the combination if you don't believe us, or go back home.

Back to home

``` ### CSS ```css .n4-safe { --accent: #ffcc4d; --k: 1; position: fixed; inset: 0; z-index: 0; overflow: hidden; container-type: size; display: grid; place-items: center; background: #000; color: #f5f5f7; font-family: -apple-system,BlinkMacSystemFont,"SF Pro Display","Inter","Segoe UI",system-ui,sans-serif; -webkit-font-smoothing: antialiased; text-align: center; line-height: 1.4; } .n4-safe *,.n4-safe *::before,.n4-safe *::after { box-sizing: border-box; } .n4-safe .n4-copy { position: relative; z-index: 5; display: flex; flex-direction: column; align-items: center; gap: 1.6cqmin; width: 100%; max-width: 680px; padding: 0 6cqw; } .n4-safe .n4-title { margin: 0; font-size: clamp(17px,4.2cqmin,36px); font-weight: 600; letter-spacing: -.02em; line-height: 1.15; text-wrap: balance; } .n4-safe .n4-sub { margin: 0; max-width: 34em; font-size: clamp(13px,2.4cqmin,18px); color: #a1a1a6; text-wrap: balance; } .n4-safe .n4-tag { font: 600 clamp(10px,1.9cqmin,13px)/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); } .n4-safe .n4-cta { margin-top: 1.8cqmin; display: inline-flex; align-items: center; gap: .5em; padding: .85em 1.5em; border-radius: 999px; background: #f5f5f7; color: #000; font-size: clamp(13px,2.2cqmin,16px); font-weight: 600; text-decoration: none; transition: transform .3s cubic-bezier(.25,.1,.25,1),box-shadow .3s cubic-bezier(.25,.1,.25,1); } .n4-safe .n4-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px -10px var(--accent); } .n4-safe .n4-cta:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-safe .n4-stars,.n4-safe .n4-stars2 { position: absolute; inset: -4%; pointer-events: none; } .n4-safe .n4-stars { background-image: radial-gradient(1px 1px at 8% 12%,#fff 60%,transparent),radial-gradient(1px 1px at 22% 68%,#fff 60%,transparent),radial-gradient(1.5px 1.5px at 35% 24%,#fff 60%,transparent),radial-gradient(1px 1px at 48% 82%,#fff 60%,transparent),radial-gradient(1px 1px at 57% 9%,#fff 60%,transparent),radial-gradient(1.5px 1.5px at 66% 44%,#fff 60%,transparent),radial-gradient(1px 1px at 74% 72%,#fff 60%,transparent),radial-gradient(1px 1px at 86% 18%,#fff 60%,transparent),radial-gradient(1.5px 1.5px at 93% 58%,#fff 60%,transparent),radial-gradient(1px 1px at 14% 42%,#fff 60%,transparent),radial-gradient(1px 1px at 40% 55%,#fff 60%,transparent),radial-gradient(1px 1px at 81% 90%,#fff 60%,transparent),radial-gradient(1px 1px at 4% 88%,#fff 60%,transparent),radial-gradient(1px 1px at 62% 30%,#fff 60%,transparent); opacity: .75; animation: n4-safe-tw calc(5s / var(--k)) ease-in-out infinite alternate; } .n4-safe .n4-stars2 { background-image: radial-gradient(2px 2px at 18% 30%,rgba(255,255,255,.9) 50%,transparent),radial-gradient(1.5px 1.5px at 72% 20%,rgba(255,255,255,.8) 50%,transparent),radial-gradient(2px 2px at 30% 85%,rgba(255,255,255,.7) 50%,transparent),radial-gradient(1.5px 1.5px at 88% 70%,rgba(255,255,255,.8) 50%,transparent),radial-gradient(2px 2px at 52% 60%,rgba(255,255,255,.6) 50%,transparent),radial-gradient(1.5px 1.5px at 6% 55%,rgba(255,255,255,.8) 50%,transparent); opacity: .55; animation: n4-safe-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse; } .n4-safe [data-depth] { transition: transform .9s cubic-bezier(.2,.7,.2,1); } @keyframes n4-safe-tw { from { opacity: .3; } } @keyframes n4-safe-spin { to { transform: rotate(1turn); } } @keyframes n4-safe-fade { from { opacity: 0; transform: translateY(10px); } } @media (prefers-reduced-motion:reduce) { .n4-safe *,.n4-safe *::before,.n4-safe *::after { animation: none!important; transition: none!important; } } .n4-safe { background: radial-gradient(70% 60% at 50% 30%,#2d323a,#0d0f12 75%); color: #eef0f3; } .n4-safe .n4-vault { position: relative; width: 10em; height: 10em; font-size: min(4.3cqmin,30px); margin-bottom: 1.4cqmin; perspective: 40em; } .n4-safe .n4-inside { position: absolute; inset: .35em; display: grid; place-items: center; border-radius: .4em; background: linear-gradient(#0a0b0d,#1d2025); box-shadow: inset 0 0 1.4em #000; } .n4-safe .n4-shelf { position: absolute; left: 8%; right: 8%; top: 62%; height: .22em; background: #3a3f46; box-shadow: 0 .2em .3em rgba(0,0,0,.6); } .n4-safe .n4-note { position: relative; top: -.4em; margin: 0; padding: .5em .7em; rotate: -5deg; background: #fdf6d8; color: #3b3020; font: 500 .5em/1.2 "Segoe Print","Bradley Hand","Chalkboard SE","Comic Sans MS",cursive; box-shadow: 0 .3em .5em rgba(0,0,0,.5); } .n4-safe .n4-door { position: absolute; inset: 0; border-radius: .5em; transform-origin: 0 50%; background: radial-gradient(circle at 12% 12%,#7c848d 0 .1em,transparent .13em),radial-gradient(circle at 88% 12%,#7c848d 0 .1em,transparent .13em),radial-gradient(circle at 12% 88%,#7c848d 0 .1em,transparent .13em),radial-gradient(circle at 88% 88%,#7c848d 0 .1em,transparent .13em),linear-gradient(135deg,#5e656e,#30353b 45%,#474d55 70%,#23272c); box-shadow: inset 0 0 0 .1em #6f7780,inset 0 0 0 .35em #2a2e33,inset 0 0 0 .42em #5a6168,0 .6em 1em -.3em #000; transition: transform calc(1.1s / var(--k)) cubic-bezier(.5,0,.2,1); } .n4-safe .n4-open .n4-door { transform: rotateY(-80deg); } .n4-safe .n4-err .n4-door { animation: n4-safe-shake calc(.4s / var(--k)); } .n4-safe .n4-hinge { position: absolute; left: -.16em; top: 1.5em; width: .32em; height: 1.5em; border-radius: .14em; background: linear-gradient(90deg,#383d43,#a3aab2,#383d43); } .n4-safe .n4-h2 { top: auto; bottom: 1.5em; } .n4-safe .n4-code { position: absolute; top: .75em; left: 50%; translate: -50% 0; display: flex; gap: .12em; } .n4-safe .n4-code b { display: grid; place-items: center; width: 1.15em; height: 1.4em; border-radius: .14em; background: #0b0c0e; color: var(--accent); font: 700 .55em/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; box-shadow: inset 0 0 0 .08em #4a5058; } .n4-safe .n4-led { position: absolute; top: .95em; right: 1em; width: .32em; height: .32em; border-radius: 50%; background: #3a2a1a; box-shadow: inset 0 0 0 .04em #000; } .n4-safe .n4-err .n4-led { background: #ff4d4d; box-shadow: 0 0 .4em #ff4d4d; } .n4-safe .n4-open .n4-led { background: #4ade80; box-shadow: 0 0 .4em #4ade80; } .n4-safe .n4-mark { position: absolute; left: 50%; top: 2.15em; width: 0; height: 0; translate: -50% 0; border: .16em solid transparent; border-top: .24em solid var(--accent); } .n4-safe .n4-dial { position: absolute; left: 50%; top: 5.15em; width: 5.3em; height: 5.3em; translate: -50% -50%; border-radius: 50%; cursor: grab; touch-action: none; } .n4-safe .n4-dial:active { cursor: grabbing; } .n4-safe .n4-dial:focus-visible { outline: 2px solid var(--accent); outline-offset: .2em; } .n4-safe .n4-ring { position: absolute; inset: 0; border-radius: 50%; background: radial-gradient(circle,#c9ced4 0 44%,#7b828a 45% 47%,#17191c 48% 85%,transparent 86%),repeating-conic-gradient(#3a3e44 0 3deg,#7d848c 3deg 6deg); box-shadow: 0 .25em .45em rgba(0,0,0,.6); rotate: var(--rot,0deg); transition: rotate .25s cubic-bezier(.3,1.5,.5,1); } .n4-safe .n4-ring.n4-drag { transition: none; } .n4-safe .n4-ring b { position: absolute; left: 50%; top: 50%; display: grid; place-items: center; width: 1.4em; height: 1.4em; margin: -.7em; font: 700 .44em/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; color: #f2f4f7; transform: rotate(calc(var(--i) * 36deg)) translateY(-4.15em); } .n4-safe .n4-cap { position: absolute; inset: 32%; border-radius: 50%; background: repeating-conic-gradient(from 0deg,#aeb4bb 0 10deg,#dfe3e7 10deg 20deg); box-shadow: inset 0 0 0 .08em #8c939b,0 .08em .2em rgba(0,0,0,.4); pointer-events: none; } .n4-safe .n4-handle { position: absolute; right: .6em; top: 50%; width: .36em; height: 2.4em; translate: 0 -50%; border-radius: .2em; background: linear-gradient(90deg,#7d848c,#e3e6ea,#6d747c); box-shadow: 0 .1em .2em rgba(0,0,0,.5); } .n4-safe .n4-try { position: absolute; left: 50%; bottom: .62em; translate: -50% 0; padding: .6em 1.1em; border: 0; border-radius: 999px; cursor: pointer; font: 700 .4em/1 system-ui,sans-serif; letter-spacing: .06em; white-space: nowrap; color: #2a1d05; background: linear-gradient(#f6d985,#b98a26); box-shadow: 0 .2em 0 #6e5212; transition: transform .1s,box-shadow .1s,filter .2s; } .n4-safe .n4-try:hover { filter: brightness(1.08); } .n4-safe .n4-try:active { transform: translateY(.15em); box-shadow: 0 .05em 0 #6e5212; } .n4-safe .n4-try:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-safe .n4-title { font-size: clamp(20px,5cqmin,42px); font-weight: 700; letter-spacing: -.025em; } .n4-safe .n4-sub { color: #a9b0b9; } .n4-safe .n4-cta { background: var(--accent); color: #1d1503; } .n4-safe .n4-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; } @keyframes n4-safe-shake { 20%,60% { translate: -.14em 0; } 40%,80% { translate: .14em 0; } } ``` ### JavaScript ```js document.querySelectorAll(".n4-safe").forEach((el) => { const vault = el.querySelector(".n4-vault"); const dial = el.querySelector(".n4-dial"); const ring = el.querySelector(".n4-ring"); const slots = el.querySelectorAll(".n4-code b"); const btn = el.querySelector(".n4-try"); const live = el.querySelector(".n4-sr"); const LABEL = btn.textContent; let rot = 0, code = [], open = false, drag = null, timer = 0; const val = () => ((Math.round(-rot / 36) % 10) + 10) % 10; const paint = () => { ring.style.setProperty("--rot", rot + "deg"); dial.setAttribute("aria-valuenow", String(val())); slots.forEach((s, i) => { s.textContent = code[i] === undefined ? "·" : String(code[i]); }); }; const step = (d) => { rot -= d * 36; paint(); }; const press = () => { clearTimeout(timer); if (open) { open = false; code = []; vault.classList.remove("n4-open"); btn.textContent = LABEL; live.textContent = ""; paint(); } else { code.push(val()); paint(); if (code.length === 3 && code.join("") === "404") { open = true; vault.classList.add("n4-open"); btn.textContent = "Close the door"; live.textContent = "Safe open: it's empty"; } else if (code.length === 3) { vault.classList.add("n4-err"); live.textContent = "Wrong combination"; timer = setTimeout(() => { vault.classList.remove("n4-err"); code = []; paint(); }, 900); } } }; dial.addEventListener("keydown", (e) => { if (e.key === "ArrowRight" || e.key === "ArrowUp") { e.preventDefault(); step(1); } else if (e.key === "ArrowLeft" || e.key === "ArrowDown") { e.preventDefault(); step(-1); } else if (e.key === "Enter" || e.key === " ") { e.preventDefault(); press(); } }); const angle = (e) => { const r = dial.getBoundingClientRect(); return (Math.atan2(e.clientX - r.left - r.width / 2, r.top + r.height / 2 - e.clientY) * 180) / Math.PI; }; dial.addEventListener("pointerdown", (e) => { drag = angle(e); dial.setPointerCapture(e.pointerId); ring.classList.add("n4-drag"); }); dial.addEventListener("pointermove", (e) => { if (drag === null) return; const a = angle(e); let d = a - drag; if (d > 180) d -= 360; if (d < -180) d += 360; rot += d; drag = a; paint(); }); const end = () => { if (drag === null) return; drag = null; ring.classList.remove("n4-drag"); rot = Math.round(rot / 36) * 36; paint(); }; dial.addEventListener("pointerup", end); dial.addEventListener("pointercancel", end); btn.addEventListener("click", press); paint(); }); ``` ### React ```tsx // @ts-nocheck: setup() es JavaScript del DOM sin tipos. import { useEffect, useRef, type CSSProperties } from "react"; const css = ` .n4-safe { --accent: #ffcc4d; --k: 1; position: fixed; inset: 0; z-index: 0; overflow: hidden; container-type: size; display: grid; place-items: center; background: #000; color: #f5f5f7; font-family: -apple-system,BlinkMacSystemFont,"SF Pro Display","Inter","Segoe UI",system-ui,sans-serif; -webkit-font-smoothing: antialiased; text-align: center; line-height: 1.4; } .n4-safe *,.n4-safe *::before,.n4-safe *::after { box-sizing: border-box; } .n4-safe .n4-copy { position: relative; z-index: 5; display: flex; flex-direction: column; align-items: center; gap: 1.6cqmin; width: 100%; max-width: 680px; padding: 0 6cqw; } .n4-safe .n4-title { margin: 0; font-size: clamp(17px,4.2cqmin,36px); font-weight: 600; letter-spacing: -.02em; line-height: 1.15; text-wrap: balance; } .n4-safe .n4-sub { margin: 0; max-width: 34em; font-size: clamp(13px,2.4cqmin,18px); color: #a1a1a6; text-wrap: balance; } .n4-safe .n4-tag { font: 600 clamp(10px,1.9cqmin,13px)/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); } .n4-safe .n4-cta { margin-top: 1.8cqmin; display: inline-flex; align-items: center; gap: .5em; padding: .85em 1.5em; border-radius: 999px; background: #f5f5f7; color: #000; font-size: clamp(13px,2.2cqmin,16px); font-weight: 600; text-decoration: none; transition: transform .3s cubic-bezier(.25,.1,.25,1),box-shadow .3s cubic-bezier(.25,.1,.25,1); } .n4-safe .n4-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px -10px var(--accent); } .n4-safe .n4-cta:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-safe .n4-stars,.n4-safe .n4-stars2 { position: absolute; inset: -4%; pointer-events: none; } .n4-safe .n4-stars { background-image: radial-gradient(1px 1px at 8% 12%,#fff 60%,transparent),radial-gradient(1px 1px at 22% 68%,#fff 60%,transparent),radial-gradient(1.5px 1.5px at 35% 24%,#fff 60%,transparent),radial-gradient(1px 1px at 48% 82%,#fff 60%,transparent),radial-gradient(1px 1px at 57% 9%,#fff 60%,transparent),radial-gradient(1.5px 1.5px at 66% 44%,#fff 60%,transparent),radial-gradient(1px 1px at 74% 72%,#fff 60%,transparent),radial-gradient(1px 1px at 86% 18%,#fff 60%,transparent),radial-gradient(1.5px 1.5px at 93% 58%,#fff 60%,transparent),radial-gradient(1px 1px at 14% 42%,#fff 60%,transparent),radial-gradient(1px 1px at 40% 55%,#fff 60%,transparent),radial-gradient(1px 1px at 81% 90%,#fff 60%,transparent),radial-gradient(1px 1px at 4% 88%,#fff 60%,transparent),radial-gradient(1px 1px at 62% 30%,#fff 60%,transparent); opacity: .75; animation: n4-safe-tw calc(5s / var(--k)) ease-in-out infinite alternate; } .n4-safe .n4-stars2 { background-image: radial-gradient(2px 2px at 18% 30%,rgba(255,255,255,.9) 50%,transparent),radial-gradient(1.5px 1.5px at 72% 20%,rgba(255,255,255,.8) 50%,transparent),radial-gradient(2px 2px at 30% 85%,rgba(255,255,255,.7) 50%,transparent),radial-gradient(1.5px 1.5px at 88% 70%,rgba(255,255,255,.8) 50%,transparent),radial-gradient(2px 2px at 52% 60%,rgba(255,255,255,.6) 50%,transparent),radial-gradient(1.5px 1.5px at 6% 55%,rgba(255,255,255,.8) 50%,transparent); opacity: .55; animation: n4-safe-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse; } .n4-safe [data-depth] { transition: transform .9s cubic-bezier(.2,.7,.2,1); } @keyframes n4-safe-tw { from { opacity: .3; } } @keyframes n4-safe-spin { to { transform: rotate(1turn); } } @keyframes n4-safe-fade { from { opacity: 0; transform: translateY(10px); } } @media (prefers-reduced-motion:reduce) { .n4-safe *,.n4-safe *::before,.n4-safe *::after { animation: none!important; transition: none!important; } } .n4-safe { background: radial-gradient(70% 60% at 50% 30%,#2d323a,#0d0f12 75%); color: #eef0f3; } .n4-safe .n4-vault { position: relative; width: 10em; height: 10em; font-size: min(4.3cqmin,30px); margin-bottom: 1.4cqmin; perspective: 40em; } .n4-safe .n4-inside { position: absolute; inset: .35em; display: grid; place-items: center; border-radius: .4em; background: linear-gradient(#0a0b0d,#1d2025); box-shadow: inset 0 0 1.4em #000; } .n4-safe .n4-shelf { position: absolute; left: 8%; right: 8%; top: 62%; height: .22em; background: #3a3f46; box-shadow: 0 .2em .3em rgba(0,0,0,.6); } .n4-safe .n4-note { position: relative; top: -.4em; margin: 0; padding: .5em .7em; rotate: -5deg; background: #fdf6d8; color: #3b3020; font: 500 .5em/1.2 "Segoe Print","Bradley Hand","Chalkboard SE","Comic Sans MS",cursive; box-shadow: 0 .3em .5em rgba(0,0,0,.5); } .n4-safe .n4-door { position: absolute; inset: 0; border-radius: .5em; transform-origin: 0 50%; background: radial-gradient(circle at 12% 12%,#7c848d 0 .1em,transparent .13em),radial-gradient(circle at 88% 12%,#7c848d 0 .1em,transparent .13em),radial-gradient(circle at 12% 88%,#7c848d 0 .1em,transparent .13em),radial-gradient(circle at 88% 88%,#7c848d 0 .1em,transparent .13em),linear-gradient(135deg,#5e656e,#30353b 45%,#474d55 70%,#23272c); box-shadow: inset 0 0 0 .1em #6f7780,inset 0 0 0 .35em #2a2e33,inset 0 0 0 .42em #5a6168,0 .6em 1em -.3em #000; transition: transform calc(1.1s / var(--k)) cubic-bezier(.5,0,.2,1); } .n4-safe .n4-open .n4-door { transform: rotateY(-80deg); } .n4-safe .n4-err .n4-door { animation: n4-safe-shake calc(.4s / var(--k)); } .n4-safe .n4-hinge { position: absolute; left: -.16em; top: 1.5em; width: .32em; height: 1.5em; border-radius: .14em; background: linear-gradient(90deg,#383d43,#a3aab2,#383d43); } .n4-safe .n4-h2 { top: auto; bottom: 1.5em; } .n4-safe .n4-code { position: absolute; top: .75em; left: 50%; translate: -50% 0; display: flex; gap: .12em; } .n4-safe .n4-code b { display: grid; place-items: center; width: 1.15em; height: 1.4em; border-radius: .14em; background: #0b0c0e; color: var(--accent); font: 700 .55em/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; box-shadow: inset 0 0 0 .08em #4a5058; } .n4-safe .n4-led { position: absolute; top: .95em; right: 1em; width: .32em; height: .32em; border-radius: 50%; background: #3a2a1a; box-shadow: inset 0 0 0 .04em #000; } .n4-safe .n4-err .n4-led { background: #ff4d4d; box-shadow: 0 0 .4em #ff4d4d; } .n4-safe .n4-open .n4-led { background: #4ade80; box-shadow: 0 0 .4em #4ade80; } .n4-safe .n4-mark { position: absolute; left: 50%; top: 2.15em; width: 0; height: 0; translate: -50% 0; border: .16em solid transparent; border-top: .24em solid var(--accent); } .n4-safe .n4-dial { position: absolute; left: 50%; top: 5.15em; width: 5.3em; height: 5.3em; translate: -50% -50%; border-radius: 50%; cursor: grab; touch-action: none; } .n4-safe .n4-dial:active { cursor: grabbing; } .n4-safe .n4-dial:focus-visible { outline: 2px solid var(--accent); outline-offset: .2em; } .n4-safe .n4-ring { position: absolute; inset: 0; border-radius: 50%; background: radial-gradient(circle,#c9ced4 0 44%,#7b828a 45% 47%,#17191c 48% 85%,transparent 86%),repeating-conic-gradient(#3a3e44 0 3deg,#7d848c 3deg 6deg); box-shadow: 0 .25em .45em rgba(0,0,0,.6); rotate: var(--rot,0deg); transition: rotate .25s cubic-bezier(.3,1.5,.5,1); } .n4-safe .n4-ring.n4-drag { transition: none; } .n4-safe .n4-ring b { position: absolute; left: 50%; top: 50%; display: grid; place-items: center; width: 1.4em; height: 1.4em; margin: -.7em; font: 700 .44em/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; color: #f2f4f7; transform: rotate(calc(var(--i) * 36deg)) translateY(-4.15em); } .n4-safe .n4-cap { position: absolute; inset: 32%; border-radius: 50%; background: repeating-conic-gradient(from 0deg,#aeb4bb 0 10deg,#dfe3e7 10deg 20deg); box-shadow: inset 0 0 0 .08em #8c939b,0 .08em .2em rgba(0,0,0,.4); pointer-events: none; } .n4-safe .n4-handle { position: absolute; right: .6em; top: 50%; width: .36em; height: 2.4em; translate: 0 -50%; border-radius: .2em; background: linear-gradient(90deg,#7d848c,#e3e6ea,#6d747c); box-shadow: 0 .1em .2em rgba(0,0,0,.5); } .n4-safe .n4-try { position: absolute; left: 50%; bottom: .62em; translate: -50% 0; padding: .6em 1.1em; border: 0; border-radius: 999px; cursor: pointer; font: 700 .4em/1 system-ui,sans-serif; letter-spacing: .06em; white-space: nowrap; color: #2a1d05; background: linear-gradient(#f6d985,#b98a26); box-shadow: 0 .2em 0 #6e5212; transition: transform .1s,box-shadow .1s,filter .2s; } .n4-safe .n4-try:hover { filter: brightness(1.08); } .n4-safe .n4-try:active { transform: translateY(.15em); box-shadow: 0 .05em 0 #6e5212; } .n4-safe .n4-try:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-safe .n4-title { font-size: clamp(20px,5cqmin,42px); font-weight: 700; letter-spacing: -.025em; } .n4-safe .n4-sub { color: #a9b0b9; } .n4-safe .n4-cta { background: var(--accent); color: #1d1503; } .n4-safe .n4-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; } @keyframes n4-safe-shake { 20%,60% { translate: -.14em 0; } 40%,80% { translate: .14em 0; } } `; // Parallax con el puntero: JavaScript del DOM, el mismo de la pestaña JS. // eslint-disable-next-line @typescript-eslint/no-explicit-any function setup(el: any) { const vault = el.querySelector(".n4-vault"); const dial = el.querySelector(".n4-dial"); const ring = el.querySelector(".n4-ring"); const slots = el.querySelectorAll(".n4-code b"); const btn = el.querySelector(".n4-try"); const live = el.querySelector(".n4-sr"); const LABEL = btn.textContent; let rot = 0, code = [], open = false, drag = null, timer = 0; const val = () => ((Math.round(-rot / 36) % 10) + 10) % 10; const paint = () => { ring.style.setProperty("--rot", rot + "deg"); dial.setAttribute("aria-valuenow", String(val())); slots.forEach((s, i) => { s.textContent = code[i] === undefined ? "·" : String(code[i]); }); }; const step = (d) => { rot -= d * 36; paint(); }; const press = () => { clearTimeout(timer); if (open) { open = false; code = []; vault.classList.remove("n4-open"); btn.textContent = LABEL; live.textContent = ""; paint(); } else { code.push(val()); paint(); if (code.length === 3 && code.join("") === "404") { open = true; vault.classList.add("n4-open"); btn.textContent = "Close the door"; live.textContent = "Safe open: it's empty"; } else if (code.length === 3) { vault.classList.add("n4-err"); live.textContent = "Wrong combination"; timer = setTimeout(() => { vault.classList.remove("n4-err"); code = []; paint(); }, 900); } } }; dial.addEventListener("keydown", (e) => { if (e.key === "ArrowRight" || e.key === "ArrowUp") { e.preventDefault(); step(1); } else if (e.key === "ArrowLeft" || e.key === "ArrowDown") { e.preventDefault(); step(-1); } else if (e.key === "Enter" || e.key === " ") { e.preventDefault(); press(); } }); const angle = (e) => { const r = dial.getBoundingClientRect(); return (Math.atan2(e.clientX - r.left - r.width / 2, r.top + r.height / 2 - e.clientY) * 180) / Math.PI; }; dial.addEventListener("pointerdown", (e) => { drag = angle(e); dial.setPointerCapture(e.pointerId); ring.classList.add("n4-drag"); }); dial.addEventListener("pointermove", (e) => { if (drag === null) return; const a = angle(e); let d = a - drag; if (d > 180) d -= 360; if (d < -180) d += 360; rot += d; drag = a; paint(); }); const end = () => { if (drag === null) return; drag = null; ring.classList.remove("n4-drag"); rot = Math.round(rot / 36) * 36; paint(); }; dial.addEventListener("pointerup", end); dial.addEventListener("pointercancel", end); btn.addEventListener("click", press); paint(); return () => clearTimeout(timer); } export default function NotFoundSafe() { const ref = useRef(null); useEffect(() => { const el = ref.current?.firstElementChild; return el ? setup(el) : undefined; }, []); return ( <>

Combination: 4 · 0 · 4

We opened the safe and there's nothing inside.

The page you're looking for wasn't kept in here. Try the combination if you don't believe us, or go back home.

Back to home

); } ``` ## Prompt for AI assistants Paste this into ChatGPT, Claude, Cursor, v0 or Lovable to adapt the block to your stack (Tailwind, Vue, Svelte…): ````text I want to add the “Safe combination 404” block (404) from AIMRAN Library to my project. ## What it is A steel safe with a dial you turn by dragging or with the arrow keys; enter 4, 0, 4 and the door swings open. ## Chosen settings - Accent color: #ffcc4d - Speed: 1x (from 0.5 to 2x) - Title: "Hemos abierto la caja y no hay nada." - Message: "La página que buscas no estaba guardada aquí. Prueba la combinación si no te lo crees, o vuelve al inicio." - Button: "Volver al inicio" ## What I need 1. Add it to my project with the same look and animation as the reference code: same sizes, colours, radii, shadows, timings and easing. 2. It is built with plain HTML and CSS (the reference wraps it in a React component with its CSS). If my project uses something else (Vue, Svelte, Astro, plain HTML…), translate it without losing any behaviour. If I use Tailwind, turn the styles into classes; if not, keep the CSS in its own file. 3. Expose the settings above as props (or CSS variables) with those values as defaults. 4. Make it work well on phones: nothing that depends only on hover, touch targets of at least 44 px and no overflow on 320 px screens. 5. Make it look right in light and dark mode. 6. Keep it accessible: semantic HTML, roles and aria-* where needed, visible focus and keyboard support. 7. Respect prefers-reduced-motion: with reduced motion, no big animations but the same end result. ## Reference code ```tsx // @ts-nocheck: setup() es JavaScript del DOM sin tipos. import { useEffect, useRef, type CSSProperties } from "react"; const css = ` .n4-safe { --accent: #ffcc4d; --k: 1; position: fixed; inset: 0; z-index: 0; overflow: hidden; container-type: size; display: grid; place-items: center; background: #000; color: #f5f5f7; font-family: -apple-system,BlinkMacSystemFont,"SF Pro Display","Inter","Segoe UI",system-ui,sans-serif; -webkit-font-smoothing: antialiased; text-align: center; line-height: 1.4; } .n4-safe *,.n4-safe *::before,.n4-safe *::after { box-sizing: border-box; } .n4-safe .n4-copy { position: relative; z-index: 5; display: flex; flex-direction: column; align-items: center; gap: 1.6cqmin; width: 100%; max-width: 680px; padding: 0 6cqw; } .n4-safe .n4-title { margin: 0; font-size: clamp(17px,4.2cqmin,36px); font-weight: 600; letter-spacing: -.02em; line-height: 1.15; text-wrap: balance; } .n4-safe .n4-sub { margin: 0; max-width: 34em; font-size: clamp(13px,2.4cqmin,18px); color: #a1a1a6; text-wrap: balance; } .n4-safe .n4-tag { font: 600 clamp(10px,1.9cqmin,13px)/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); } .n4-safe .n4-cta { margin-top: 1.8cqmin; display: inline-flex; align-items: center; gap: .5em; padding: .85em 1.5em; border-radius: 999px; background: #f5f5f7; color: #000; font-size: clamp(13px,2.2cqmin,16px); font-weight: 600; text-decoration: none; transition: transform .3s cubic-bezier(.25,.1,.25,1),box-shadow .3s cubic-bezier(.25,.1,.25,1); } .n4-safe .n4-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px -10px var(--accent); } .n4-safe .n4-cta:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-safe .n4-stars,.n4-safe .n4-stars2 { position: absolute; inset: -4%; pointer-events: none; } .n4-safe .n4-stars { background-image: radial-gradient(1px 1px at 8% 12%,#fff 60%,transparent),radial-gradient(1px 1px at 22% 68%,#fff 60%,transparent),radial-gradient(1.5px 1.5px at 35% 24%,#fff 60%,transparent),radial-gradient(1px 1px at 48% 82%,#fff 60%,transparent),radial-gradient(1px 1px at 57% 9%,#fff 60%,transparent),radial-gradient(1.5px 1.5px at 66% 44%,#fff 60%,transparent),radial-gradient(1px 1px at 74% 72%,#fff 60%,transparent),radial-gradient(1px 1px at 86% 18%,#fff 60%,transparent),radial-gradient(1.5px 1.5px at 93% 58%,#fff 60%,transparent),radial-gradient(1px 1px at 14% 42%,#fff 60%,transparent),radial-gradient(1px 1px at 40% 55%,#fff 60%,transparent),radial-gradient(1px 1px at 81% 90%,#fff 60%,transparent),radial-gradient(1px 1px at 4% 88%,#fff 60%,transparent),radial-gradient(1px 1px at 62% 30%,#fff 60%,transparent); opacity: .75; animation: n4-safe-tw calc(5s / var(--k)) ease-in-out infinite alternate; } .n4-safe .n4-stars2 { background-image: radial-gradient(2px 2px at 18% 30%,rgba(255,255,255,.9) 50%,transparent),radial-gradient(1.5px 1.5px at 72% 20%,rgba(255,255,255,.8) 50%,transparent),radial-gradient(2px 2px at 30% 85%,rgba(255,255,255,.7) 50%,transparent),radial-gradient(1.5px 1.5px at 88% 70%,rgba(255,255,255,.8) 50%,transparent),radial-gradient(2px 2px at 52% 60%,rgba(255,255,255,.6) 50%,transparent),radial-gradient(1.5px 1.5px at 6% 55%,rgba(255,255,255,.8) 50%,transparent); opacity: .55; animation: n4-safe-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse; } .n4-safe [data-depth] { transition: transform .9s cubic-bezier(.2,.7,.2,1); } @keyframes n4-safe-tw { from { opacity: .3; } } @keyframes n4-safe-spin { to { transform: rotate(1turn); } } @keyframes n4-safe-fade { from { opacity: 0; transform: translateY(10px); } } @media (prefers-reduced-motion:reduce) { .n4-safe *,.n4-safe *::before,.n4-safe *::after { animation: none!important; transition: none!important; } } .n4-safe { background: radial-gradient(70% 60% at 50% 30%,#2d323a,#0d0f12 75%); color: #eef0f3; } .n4-safe .n4-vault { position: relative; width: 10em; height: 10em; font-size: min(4.3cqmin,30px); margin-bottom: 1.4cqmin; perspective: 40em; } .n4-safe .n4-inside { position: absolute; inset: .35em; display: grid; place-items: center; border-radius: .4em; background: linear-gradient(#0a0b0d,#1d2025); box-shadow: inset 0 0 1.4em #000; } .n4-safe .n4-shelf { position: absolute; left: 8%; right: 8%; top: 62%; height: .22em; background: #3a3f46; box-shadow: 0 .2em .3em rgba(0,0,0,.6); } .n4-safe .n4-note { position: relative; top: -.4em; margin: 0; padding: .5em .7em; rotate: -5deg; background: #fdf6d8; color: #3b3020; font: 500 .5em/1.2 "Segoe Print","Bradley Hand","Chalkboard SE","Comic Sans MS",cursive; box-shadow: 0 .3em .5em rgba(0,0,0,.5); } .n4-safe .n4-door { position: absolute; inset: 0; border-radius: .5em; transform-origin: 0 50%; background: radial-gradient(circle at 12% 12%,#7c848d 0 .1em,transparent .13em),radial-gradient(circle at 88% 12%,#7c848d 0 .1em,transparent .13em),radial-gradient(circle at 12% 88%,#7c848d 0 .1em,transparent .13em),radial-gradient(circle at 88% 88%,#7c848d 0 .1em,transparent .13em),linear-gradient(135deg,#5e656e,#30353b 45%,#474d55 70%,#23272c); box-shadow: inset 0 0 0 .1em #6f7780,inset 0 0 0 .35em #2a2e33,inset 0 0 0 .42em #5a6168,0 .6em 1em -.3em #000; transition: transform calc(1.1s / var(--k)) cubic-bezier(.5,0,.2,1); } .n4-safe .n4-open .n4-door { transform: rotateY(-80deg); } .n4-safe .n4-err .n4-door { animation: n4-safe-shake calc(.4s / var(--k)); } .n4-safe .n4-hinge { position: absolute; left: -.16em; top: 1.5em; width: .32em; height: 1.5em; border-radius: .14em; background: linear-gradient(90deg,#383d43,#a3aab2,#383d43); } .n4-safe .n4-h2 { top: auto; bottom: 1.5em; } .n4-safe .n4-code { position: absolute; top: .75em; left: 50%; translate: -50% 0; display: flex; gap: .12em; } .n4-safe .n4-code b { display: grid; place-items: center; width: 1.15em; height: 1.4em; border-radius: .14em; background: #0b0c0e; color: var(--accent); font: 700 .55em/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; box-shadow: inset 0 0 0 .08em #4a5058; } .n4-safe .n4-led { position: absolute; top: .95em; right: 1em; width: .32em; height: .32em; border-radius: 50%; background: #3a2a1a; box-shadow: inset 0 0 0 .04em #000; } .n4-safe .n4-err .n4-led { background: #ff4d4d; box-shadow: 0 0 .4em #ff4d4d; } .n4-safe .n4-open .n4-led { background: #4ade80; box-shadow: 0 0 .4em #4ade80; } .n4-safe .n4-mark { position: absolute; left: 50%; top: 2.15em; width: 0; height: 0; translate: -50% 0; border: .16em solid transparent; border-top: .24em solid var(--accent); } .n4-safe .n4-dial { position: absolute; left: 50%; top: 5.15em; width: 5.3em; height: 5.3em; translate: -50% -50%; border-radius: 50%; cursor: grab; touch-action: none; } .n4-safe .n4-dial:active { cursor: grabbing; } .n4-safe .n4-dial:focus-visible { outline: 2px solid var(--accent); outline-offset: .2em; } .n4-safe .n4-ring { position: absolute; inset: 0; border-radius: 50%; background: radial-gradient(circle,#c9ced4 0 44%,#7b828a 45% 47%,#17191c 48% 85%,transparent 86%),repeating-conic-gradient(#3a3e44 0 3deg,#7d848c 3deg 6deg); box-shadow: 0 .25em .45em rgba(0,0,0,.6); rotate: var(--rot,0deg); transition: rotate .25s cubic-bezier(.3,1.5,.5,1); } .n4-safe .n4-ring.n4-drag { transition: none; } .n4-safe .n4-ring b { position: absolute; left: 50%; top: 50%; display: grid; place-items: center; width: 1.4em; height: 1.4em; margin: -.7em; font: 700 .44em/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; color: #f2f4f7; transform: rotate(calc(var(--i) * 36deg)) translateY(-4.15em); } .n4-safe .n4-cap { position: absolute; inset: 32%; border-radius: 50%; background: repeating-conic-gradient(from 0deg,#aeb4bb 0 10deg,#dfe3e7 10deg 20deg); box-shadow: inset 0 0 0 .08em #8c939b,0 .08em .2em rgba(0,0,0,.4); pointer-events: none; } .n4-safe .n4-handle { position: absolute; right: .6em; top: 50%; width: .36em; height: 2.4em; translate: 0 -50%; border-radius: .2em; background: linear-gradient(90deg,#7d848c,#e3e6ea,#6d747c); box-shadow: 0 .1em .2em rgba(0,0,0,.5); } .n4-safe .n4-try { position: absolute; left: 50%; bottom: .62em; translate: -50% 0; padding: .6em 1.1em; border: 0; border-radius: 999px; cursor: pointer; font: 700 .4em/1 system-ui,sans-serif; letter-spacing: .06em; white-space: nowrap; color: #2a1d05; background: linear-gradient(#f6d985,#b98a26); box-shadow: 0 .2em 0 #6e5212; transition: transform .1s,box-shadow .1s,filter .2s; } .n4-safe .n4-try:hover { filter: brightness(1.08); } .n4-safe .n4-try:active { transform: translateY(.15em); box-shadow: 0 .05em 0 #6e5212; } .n4-safe .n4-try:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-safe .n4-title { font-size: clamp(20px,5cqmin,42px); font-weight: 700; letter-spacing: -.025em; } .n4-safe .n4-sub { color: #a9b0b9; } .n4-safe .n4-cta { background: var(--accent); color: #1d1503; } .n4-safe .n4-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; } @keyframes n4-safe-shake { 20%,60% { translate: -.14em 0; } 40%,80% { translate: .14em 0; } } `; // Parallax con el puntero: JavaScript del DOM, el mismo de la pestaña JS. // eslint-disable-next-line @typescript-eslint/no-explicit-any function setup(el: any) { const vault = el.querySelector(".n4-vault"); const dial = el.querySelector(".n4-dial"); const ring = el.querySelector(".n4-ring"); const slots = el.querySelectorAll(".n4-code b"); const btn = el.querySelector(".n4-try"); const live = el.querySelector(".n4-sr"); const LABEL = btn.textContent; let rot = 0, code = [], open = false, drag = null, timer = 0; const val = () => ((Math.round(-rot / 36) % 10) + 10) % 10; const paint = () => { ring.style.setProperty("--rot", rot + "deg"); dial.setAttribute("aria-valuenow", String(val())); slots.forEach((s, i) => { s.textContent = code[i] === undefined ? "·" : String(code[i]); }); }; const step = (d) => { rot -= d * 36; paint(); }; const press = () => { clearTimeout(timer); if (open) { open = false; code = []; vault.classList.remove("n4-open"); btn.textContent = LABEL; live.textContent = ""; paint(); } else { code.push(val()); paint(); if (code.length === 3 && code.join("") === "404") { open = true; vault.classList.add("n4-open"); btn.textContent = "Close the door"; live.textContent = "Safe open: it's empty"; } else if (code.length === 3) { vault.classList.add("n4-err"); live.textContent = "Wrong combination"; timer = setTimeout(() => { vault.classList.remove("n4-err"); code = []; paint(); }, 900); } } }; dial.addEventListener("keydown", (e) => { if (e.key === "ArrowRight" || e.key === "ArrowUp") { e.preventDefault(); step(1); } else if (e.key === "ArrowLeft" || e.key === "ArrowDown") { e.preventDefault(); step(-1); } else if (e.key === "Enter" || e.key === " ") { e.preventDefault(); press(); } }); const angle = (e) => { const r = dial.getBoundingClientRect(); return (Math.atan2(e.clientX - r.left - r.width / 2, r.top + r.height / 2 - e.clientY) * 180) / Math.PI; }; dial.addEventListener("pointerdown", (e) => { drag = angle(e); dial.setPointerCapture(e.pointerId); ring.classList.add("n4-drag"); }); dial.addEventListener("pointermove", (e) => { if (drag === null) return; const a = angle(e); let d = a - drag; if (d > 180) d -= 360; if (d < -180) d += 360; rot += d; drag = a; paint(); }); const end = () => { if (drag === null) return; drag = null; ring.classList.remove("n4-drag"); rot = Math.round(rot / 36) * 36; paint(); }; dial.addEventListener("pointerup", end); dial.addEventListener("pointercancel", end); btn.addEventListener("click", press); paint(); return () => clearTimeout(timer); } export default function NotFoundSafe() { const ref = useRef(null); useEffect(() => { const el = ref.current?.firstElementChild; return el ? setup(el) : undefined; }, []); return ( <>

Combination: 4 · 0 · 4

We opened the safe and there's nothing inside.

The page you're looking for wasn't kept in here. Try the combination if you don't believe us, or go back home.

Back to home

); } ``` Give me the complete final code, ready to paste, and tell me in one line where to put it in my project. ````