# Sliding puzzle 404 > A wooden eight piece sliding puzzle you move by click or arrow keys; solved, it shows a toy colored 404. - Category: [404](https://library.aimran.es/components/404) - Built with: HTML + CSS - Live editor: https://library.aimran.es/blocks/404-puzzle - Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham ## Where to use it Toy shops and kids brands can turn their error page into a classic sliding puzzle. Eight lacquered tiles sit in a wooden tray, shuffled on load, and together they form a big white 404 on a red, yellow and teal gradient. Each tile shows its own slice of the image, so it reads as one picture once solved. Click a tile next to the gap or use the arrow keys to slide pieces. A status line confirms the solution, and the shuffle button starts again. Change the teal accent for the solved glow and the button. ## Code ### HTML ```html 404 · Page not found

Put the pieces in order

This page is missing some pieces.

We've searched every box in the toy shop. While it turns up, solve the puzzle or go back to the shop window.

Back to the shop window

``` ### CSS ```css .n4-puzzle { --accent: #118ab2; --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-puzzle *,.n4-puzzle *::before,.n4-puzzle *::after { box-sizing: border-box; } .n4-puzzle .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-puzzle .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-puzzle .n4-sub { margin: 0; max-width: 34em; font-size: clamp(13px,2.4cqmin,18px); color: #a1a1a6; text-wrap: balance; } .n4-puzzle .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-puzzle .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-puzzle .n4-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px -10px var(--accent); } .n4-puzzle .n4-cta:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-puzzle .n4-stars,.n4-puzzle .n4-stars2 { position: absolute; inset: -4%; pointer-events: none; } .n4-puzzle .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-puzzle-tw calc(5s / var(--k)) ease-in-out infinite alternate; } .n4-puzzle .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-puzzle-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse; } .n4-puzzle [data-depth] { transition: transform .9s cubic-bezier(.2,.7,.2,1); } @keyframes n4-puzzle-tw { from { opacity: .3; } } @keyframes n4-puzzle-spin { to { transform: rotate(1turn); } } @keyframes n4-puzzle-fade { from { opacity: 0; transform: translateY(10px); } } @media (prefers-reduced-motion:reduce) { .n4-puzzle *,.n4-puzzle *::before,.n4-puzzle *::after { animation: none!important; transition: none!important; } } .n4-puzzle { background: radial-gradient(70% 60% at 50% 30%,#fff7e6,#f4dbb0 70%,#e6bd82); color: #2b1a0e; } .n4-puzzle .n4-box { display: flex; flex-direction: column; align-items: center; gap: .8em; font-size: min(2cqmin,14px); margin-bottom: 1cqmin; } .n4-puzzle .n4-board { position: relative; width: 18em; height: 18em; border-radius: 1em; background: repeating-linear-gradient(88deg,rgba(90,50,20,.1) 0 .2em,transparent .2em 1.1em),linear-gradient(135deg,#d39a5c,#a86a34); box-shadow: inset 0 0 0 .3em #8a5427,0 1.4em 2em -1em rgba(60,30,10,.55); transition: box-shadow .4s; } .n4-puzzle .n4-board::before { content: ""; position: absolute; inset: .8em; border-radius: .4em; background: #7a4a22; box-shadow: inset 0 .2em .5em rgba(0,0,0,.5); } .n4-puzzle .n4-tile { position: absolute; left: .8em; top: .8em; width: 5.2em; height: 5.2em; padding: 0; border: 0; border-radius: .45em; overflow: hidden; cursor: pointer; transform: translate(calc(var(--x) * 5.6em),calc(var(--y) * 5.6em)); transition: transform calc(.18s / var(--k)) cubic-bezier(.2,.8,.3,1.1),filter .2s; box-shadow: 0 .2em .3em rgba(0,0,0,.35); } .n4-puzzle .n4-tile::after { content: ""; position: absolute; inset: 0; border-radius: inherit; box-shadow: inset 0 .15em 0 rgba(255,255,255,.45),inset 0 -.25em 0 rgba(0,0,0,.22); pointer-events: none; } .n4-puzzle .n4-img { position: absolute; width: 16.4em; height: 16.4em; left: calc(var(--c) * -5.6em); top: calc(var(--r) * -5.6em); display: grid; place-items: center; background: radial-gradient(circle at 18% 18%,rgba(255,255,255,.35) 0 1.2em,transparent 1.3em),radial-gradient(circle at 84% 80%,rgba(255,255,255,.25) 0 1.6em,transparent 1.7em),linear-gradient(135deg,#ef476f,#ffd166 45%,#06d6a0 75%,#118ab2); } .n4-puzzle .n4-img b { font: 900 6em/1 "Arial Black","Helvetica Neue",Impact,system-ui,sans-serif; letter-spacing: -.05em; color: #fff; text-shadow: .05em .06em 0 #073b4c; } .n4-puzzle .n4-tile small { position: absolute; right: .4em; bottom: .3em; font: 800 .85em/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; color: #fff; text-shadow: 0 1px 2px rgba(0,0,0,.6); transition: opacity .3s; } .n4-puzzle .n4-tile:hover { filter: brightness(1.08); } .n4-puzzle .n4-tile:active { filter: brightness(.92); } .n4-puzzle .n4-tile:focus-visible { outline: .2em solid #fff; outline-offset: -.4em; z-index: 1; } .n4-puzzle .n4-done .n4-board { box-shadow: inset 0 0 0 .3em #8a5427,0 0 0 .35em var(--accent),0 1.4em 2em -1em rgba(60,30,10,.55); } .n4-puzzle .n4-done .n4-tile small { opacity: 0; } .n4-puzzle .n4-bar { display: flex; align-items: center; gap: 1em; } .n4-puzzle .n4-st { margin: 0; font: 600 .95em/1.2 system-ui,sans-serif; color: #6b4a2b; } .n4-puzzle .n4-done .n4-st { color: var(--accent); font-weight: 700; } .n4-puzzle .n4-mix { padding: .55em 1.1em; border: 0; border-radius: 999px; cursor: pointer; font: 700 .9em/1 system-ui,sans-serif; background: #2b1a0e; color: #fff7e6; transition: transform .12s; } .n4-puzzle .n4-mix:hover { transform: translateY(-1px); } .n4-puzzle .n4-mix:active { transform: scale(.96); } .n4-puzzle .n4-mix:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-puzzle .n4-title { font-size: clamp(20px,5cqmin,42px); font-weight: 800; letter-spacing: -.03em; } .n4-puzzle .n4-sub { color: #6b4a2b; } .n4-puzzle .n4-cta { background: var(--accent); color: #fff; } ``` ### JavaScript ```js document.querySelectorAll(".n4-puzzle").forEach((el) => { const box = el.querySelector(".n4-box"); const board = el.querySelector(".n4-board"); const tiles = Array.from(el.querySelectorAll(".n4-tile")); const st = el.querySelector(".n4-st"); const mix = el.querySelector(".n4-mix"); const START = st.textContent; const pos = tiles.map((_, i) => i); let empty = 8; const paint = () => tiles.forEach((t, i) => { t.style.setProperty("--x", String(pos[i] % 3)); t.style.setProperty("--y", String(Math.floor(pos[i] / 3))); }); const adj = (a, b) => Math.abs((a % 3) - (b % 3)) + Math.abs(Math.floor(a / 3) - Math.floor(b / 3)) === 1; const solved = () => pos.every((p, j) => p === j); const swap = (i) => { const c = pos[i]; pos[i] = empty; empty = c; }; const move = (i) => { if (!adj(pos[i], empty)) return; swap(i); paint(); const done = solved(); box.classList.toggle("n4-done", done); st.textContent = done ? "Solved. The page still hasn't turned up." : START; }; const shuffle = () => { let prev = -1; do { for (let n = 0; n < 80; n++) { const opts = tiles.map((_, i) => i).filter((i) => i !== prev && adj(pos[i], empty)); const i = opts[Math.floor(Math.random() * opts.length)]; swap(i); prev = i; } } while (solved()); paint(); box.classList.remove("n4-done"); st.textContent = START; }; tiles.forEach((t, i) => t.addEventListener("click", () => move(i))); board.addEventListener("keydown", (e) => { const d = { ArrowLeft: 1, ArrowRight: -1, ArrowUp: 3, ArrowDown: -3 }[e.key]; if (!d) return; e.preventDefault(); const cell = empty + d; if (cell < 0 || cell > 8 || (Math.abs(d) === 1 && Math.floor(cell / 3) !== Math.floor(empty / 3))) return; const i = pos.indexOf(cell); move(i); tiles[i].focus(); }); mix.addEventListener("click", shuffle); shuffle(); }); ``` ### React ```tsx // @ts-nocheck: setup() es JavaScript del DOM sin tipos. import { useEffect, useRef, type CSSProperties } from "react"; const css = ` .n4-puzzle { --accent: #118ab2; --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-puzzle *,.n4-puzzle *::before,.n4-puzzle *::after { box-sizing: border-box; } .n4-puzzle .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-puzzle .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-puzzle .n4-sub { margin: 0; max-width: 34em; font-size: clamp(13px,2.4cqmin,18px); color: #a1a1a6; text-wrap: balance; } .n4-puzzle .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-puzzle .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-puzzle .n4-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px -10px var(--accent); } .n4-puzzle .n4-cta:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-puzzle .n4-stars,.n4-puzzle .n4-stars2 { position: absolute; inset: -4%; pointer-events: none; } .n4-puzzle .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-puzzle-tw calc(5s / var(--k)) ease-in-out infinite alternate; } .n4-puzzle .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-puzzle-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse; } .n4-puzzle [data-depth] { transition: transform .9s cubic-bezier(.2,.7,.2,1); } @keyframes n4-puzzle-tw { from { opacity: .3; } } @keyframes n4-puzzle-spin { to { transform: rotate(1turn); } } @keyframes n4-puzzle-fade { from { opacity: 0; transform: translateY(10px); } } @media (prefers-reduced-motion:reduce) { .n4-puzzle *,.n4-puzzle *::before,.n4-puzzle *::after { animation: none!important; transition: none!important; } } .n4-puzzle { background: radial-gradient(70% 60% at 50% 30%,#fff7e6,#f4dbb0 70%,#e6bd82); color: #2b1a0e; } .n4-puzzle .n4-box { display: flex; flex-direction: column; align-items: center; gap: .8em; font-size: min(2cqmin,14px); margin-bottom: 1cqmin; } .n4-puzzle .n4-board { position: relative; width: 18em; height: 18em; border-radius: 1em; background: repeating-linear-gradient(88deg,rgba(90,50,20,.1) 0 .2em,transparent .2em 1.1em),linear-gradient(135deg,#d39a5c,#a86a34); box-shadow: inset 0 0 0 .3em #8a5427,0 1.4em 2em -1em rgba(60,30,10,.55); transition: box-shadow .4s; } .n4-puzzle .n4-board::before { content: ""; position: absolute; inset: .8em; border-radius: .4em; background: #7a4a22; box-shadow: inset 0 .2em .5em rgba(0,0,0,.5); } .n4-puzzle .n4-tile { position: absolute; left: .8em; top: .8em; width: 5.2em; height: 5.2em; padding: 0; border: 0; border-radius: .45em; overflow: hidden; cursor: pointer; transform: translate(calc(var(--x) * 5.6em),calc(var(--y) * 5.6em)); transition: transform calc(.18s / var(--k)) cubic-bezier(.2,.8,.3,1.1),filter .2s; box-shadow: 0 .2em .3em rgba(0,0,0,.35); } .n4-puzzle .n4-tile::after { content: ""; position: absolute; inset: 0; border-radius: inherit; box-shadow: inset 0 .15em 0 rgba(255,255,255,.45),inset 0 -.25em 0 rgba(0,0,0,.22); pointer-events: none; } .n4-puzzle .n4-img { position: absolute; width: 16.4em; height: 16.4em; left: calc(var(--c) * -5.6em); top: calc(var(--r) * -5.6em); display: grid; place-items: center; background: radial-gradient(circle at 18% 18%,rgba(255,255,255,.35) 0 1.2em,transparent 1.3em),radial-gradient(circle at 84% 80%,rgba(255,255,255,.25) 0 1.6em,transparent 1.7em),linear-gradient(135deg,#ef476f,#ffd166 45%,#06d6a0 75%,#118ab2); } .n4-puzzle .n4-img b { font: 900 6em/1 "Arial Black","Helvetica Neue",Impact,system-ui,sans-serif; letter-spacing: -.05em; color: #fff; text-shadow: .05em .06em 0 #073b4c; } .n4-puzzle .n4-tile small { position: absolute; right: .4em; bottom: .3em; font: 800 .85em/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; color: #fff; text-shadow: 0 1px 2px rgba(0,0,0,.6); transition: opacity .3s; } .n4-puzzle .n4-tile:hover { filter: brightness(1.08); } .n4-puzzle .n4-tile:active { filter: brightness(.92); } .n4-puzzle .n4-tile:focus-visible { outline: .2em solid #fff; outline-offset: -.4em; z-index: 1; } .n4-puzzle .n4-done .n4-board { box-shadow: inset 0 0 0 .3em #8a5427,0 0 0 .35em var(--accent),0 1.4em 2em -1em rgba(60,30,10,.55); } .n4-puzzle .n4-done .n4-tile small { opacity: 0; } .n4-puzzle .n4-bar { display: flex; align-items: center; gap: 1em; } .n4-puzzle .n4-st { margin: 0; font: 600 .95em/1.2 system-ui,sans-serif; color: #6b4a2b; } .n4-puzzle .n4-done .n4-st { color: var(--accent); font-weight: 700; } .n4-puzzle .n4-mix { padding: .55em 1.1em; border: 0; border-radius: 999px; cursor: pointer; font: 700 .9em/1 system-ui,sans-serif; background: #2b1a0e; color: #fff7e6; transition: transform .12s; } .n4-puzzle .n4-mix:hover { transform: translateY(-1px); } .n4-puzzle .n4-mix:active { transform: scale(.96); } .n4-puzzle .n4-mix:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-puzzle .n4-title { font-size: clamp(20px,5cqmin,42px); font-weight: 800; letter-spacing: -.03em; } .n4-puzzle .n4-sub { color: #6b4a2b; } .n4-puzzle .n4-cta { background: var(--accent); color: #fff; } `; // 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 box = el.querySelector(".n4-box"); const board = el.querySelector(".n4-board"); const tiles = Array.from(el.querySelectorAll(".n4-tile")); const st = el.querySelector(".n4-st"); const mix = el.querySelector(".n4-mix"); const START = st.textContent; const pos = tiles.map((_, i) => i); let empty = 8; const paint = () => tiles.forEach((t, i) => { t.style.setProperty("--x", String(pos[i] % 3)); t.style.setProperty("--y", String(Math.floor(pos[i] / 3))); }); const adj = (a, b) => Math.abs((a % 3) - (b % 3)) + Math.abs(Math.floor(a / 3) - Math.floor(b / 3)) === 1; const solved = () => pos.every((p, j) => p === j); const swap = (i) => { const c = pos[i]; pos[i] = empty; empty = c; }; const move = (i) => { if (!adj(pos[i], empty)) return; swap(i); paint(); const done = solved(); box.classList.toggle("n4-done", done); st.textContent = done ? "Solved. The page still hasn't turned up." : START; }; const shuffle = () => { let prev = -1; do { for (let n = 0; n < 80; n++) { const opts = tiles.map((_, i) => i).filter((i) => i !== prev && adj(pos[i], empty)); const i = opts[Math.floor(Math.random() * opts.length)]; swap(i); prev = i; } } while (solved()); paint(); box.classList.remove("n4-done"); st.textContent = START; }; tiles.forEach((t, i) => t.addEventListener("click", () => move(i))); board.addEventListener("keydown", (e) => { const d = { ArrowLeft: 1, ArrowRight: -1, ArrowUp: 3, ArrowDown: -3 }[e.key]; if (!d) return; e.preventDefault(); const cell = empty + d; if (cell < 0 || cell > 8 || (Math.abs(d) === 1 && Math.floor(cell / 3) !== Math.floor(empty / 3))) return; const i = pos.indexOf(cell); move(i); tiles[i].focus(); }); mix.addEventListener("click", shuffle); shuffle(); } export default function NotFoundPuzzle() { const ref = useRef(null); useEffect(() => { const el = ref.current?.firstElementChild; return el ? setup(el) : undefined; }, []); return ( <>

Put the pieces in order

This page is missing some pieces.

We've searched every box in the toy shop. While it turns up, solve the puzzle or go back to the shop window.

Back to the shop window

); } ``` ## 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 “Sliding puzzle 404” block (404) from AIMRAN Library to my project. ## What it is A wooden eight piece sliding puzzle you move by click or arrow keys; solved, it shows a toy colored 404. ## Chosen settings - Accent color: #118ab2 - Speed: 1x (from 0.5 to 2x) - Title: "A esta página le faltan piezas." - Message: "La hemos buscado en todas las cajas de la juguetería. Mientras aparece, ordena el puzle o vuelve al escaparate." - Button: "Volver al escaparate" ## 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-puzzle { --accent: #118ab2; --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-puzzle *,.n4-puzzle *::before,.n4-puzzle *::after { box-sizing: border-box; } .n4-puzzle .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-puzzle .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-puzzle .n4-sub { margin: 0; max-width: 34em; font-size: clamp(13px,2.4cqmin,18px); color: #a1a1a6; text-wrap: balance; } .n4-puzzle .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-puzzle .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-puzzle .n4-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px -10px var(--accent); } .n4-puzzle .n4-cta:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-puzzle .n4-stars,.n4-puzzle .n4-stars2 { position: absolute; inset: -4%; pointer-events: none; } .n4-puzzle .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-puzzle-tw calc(5s / var(--k)) ease-in-out infinite alternate; } .n4-puzzle .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-puzzle-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse; } .n4-puzzle [data-depth] { transition: transform .9s cubic-bezier(.2,.7,.2,1); } @keyframes n4-puzzle-tw { from { opacity: .3; } } @keyframes n4-puzzle-spin { to { transform: rotate(1turn); } } @keyframes n4-puzzle-fade { from { opacity: 0; transform: translateY(10px); } } @media (prefers-reduced-motion:reduce) { .n4-puzzle *,.n4-puzzle *::before,.n4-puzzle *::after { animation: none!important; transition: none!important; } } .n4-puzzle { background: radial-gradient(70% 60% at 50% 30%,#fff7e6,#f4dbb0 70%,#e6bd82); color: #2b1a0e; } .n4-puzzle .n4-box { display: flex; flex-direction: column; align-items: center; gap: .8em; font-size: min(2cqmin,14px); margin-bottom: 1cqmin; } .n4-puzzle .n4-board { position: relative; width: 18em; height: 18em; border-radius: 1em; background: repeating-linear-gradient(88deg,rgba(90,50,20,.1) 0 .2em,transparent .2em 1.1em),linear-gradient(135deg,#d39a5c,#a86a34); box-shadow: inset 0 0 0 .3em #8a5427,0 1.4em 2em -1em rgba(60,30,10,.55); transition: box-shadow .4s; } .n4-puzzle .n4-board::before { content: ""; position: absolute; inset: .8em; border-radius: .4em; background: #7a4a22; box-shadow: inset 0 .2em .5em rgba(0,0,0,.5); } .n4-puzzle .n4-tile { position: absolute; left: .8em; top: .8em; width: 5.2em; height: 5.2em; padding: 0; border: 0; border-radius: .45em; overflow: hidden; cursor: pointer; transform: translate(calc(var(--x) * 5.6em),calc(var(--y) * 5.6em)); transition: transform calc(.18s / var(--k)) cubic-bezier(.2,.8,.3,1.1),filter .2s; box-shadow: 0 .2em .3em rgba(0,0,0,.35); } .n4-puzzle .n4-tile::after { content: ""; position: absolute; inset: 0; border-radius: inherit; box-shadow: inset 0 .15em 0 rgba(255,255,255,.45),inset 0 -.25em 0 rgba(0,0,0,.22); pointer-events: none; } .n4-puzzle .n4-img { position: absolute; width: 16.4em; height: 16.4em; left: calc(var(--c) * -5.6em); top: calc(var(--r) * -5.6em); display: grid; place-items: center; background: radial-gradient(circle at 18% 18%,rgba(255,255,255,.35) 0 1.2em,transparent 1.3em),radial-gradient(circle at 84% 80%,rgba(255,255,255,.25) 0 1.6em,transparent 1.7em),linear-gradient(135deg,#ef476f,#ffd166 45%,#06d6a0 75%,#118ab2); } .n4-puzzle .n4-img b { font: 900 6em/1 "Arial Black","Helvetica Neue",Impact,system-ui,sans-serif; letter-spacing: -.05em; color: #fff; text-shadow: .05em .06em 0 #073b4c; } .n4-puzzle .n4-tile small { position: absolute; right: .4em; bottom: .3em; font: 800 .85em/1 ui-monospace,"SF Mono",Menlo,Consolas,monospace; color: #fff; text-shadow: 0 1px 2px rgba(0,0,0,.6); transition: opacity .3s; } .n4-puzzle .n4-tile:hover { filter: brightness(1.08); } .n4-puzzle .n4-tile:active { filter: brightness(.92); } .n4-puzzle .n4-tile:focus-visible { outline: .2em solid #fff; outline-offset: -.4em; z-index: 1; } .n4-puzzle .n4-done .n4-board { box-shadow: inset 0 0 0 .3em #8a5427,0 0 0 .35em var(--accent),0 1.4em 2em -1em rgba(60,30,10,.55); } .n4-puzzle .n4-done .n4-tile small { opacity: 0; } .n4-puzzle .n4-bar { display: flex; align-items: center; gap: 1em; } .n4-puzzle .n4-st { margin: 0; font: 600 .95em/1.2 system-ui,sans-serif; color: #6b4a2b; } .n4-puzzle .n4-done .n4-st { color: var(--accent); font-weight: 700; } .n4-puzzle .n4-mix { padding: .55em 1.1em; border: 0; border-radius: 999px; cursor: pointer; font: 700 .9em/1 system-ui,sans-serif; background: #2b1a0e; color: #fff7e6; transition: transform .12s; } .n4-puzzle .n4-mix:hover { transform: translateY(-1px); } .n4-puzzle .n4-mix:active { transform: scale(.96); } .n4-puzzle .n4-mix:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-puzzle .n4-title { font-size: clamp(20px,5cqmin,42px); font-weight: 800; letter-spacing: -.03em; } .n4-puzzle .n4-sub { color: #6b4a2b; } .n4-puzzle .n4-cta { background: var(--accent); color: #fff; } `; // 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 box = el.querySelector(".n4-box"); const board = el.querySelector(".n4-board"); const tiles = Array.from(el.querySelectorAll(".n4-tile")); const st = el.querySelector(".n4-st"); const mix = el.querySelector(".n4-mix"); const START = st.textContent; const pos = tiles.map((_, i) => i); let empty = 8; const paint = () => tiles.forEach((t, i) => { t.style.setProperty("--x", String(pos[i] % 3)); t.style.setProperty("--y", String(Math.floor(pos[i] / 3))); }); const adj = (a, b) => Math.abs((a % 3) - (b % 3)) + Math.abs(Math.floor(a / 3) - Math.floor(b / 3)) === 1; const solved = () => pos.every((p, j) => p === j); const swap = (i) => { const c = pos[i]; pos[i] = empty; empty = c; }; const move = (i) => { if (!adj(pos[i], empty)) return; swap(i); paint(); const done = solved(); box.classList.toggle("n4-done", done); st.textContent = done ? "Solved. The page still hasn't turned up." : START; }; const shuffle = () => { let prev = -1; do { for (let n = 0; n < 80; n++) { const opts = tiles.map((_, i) => i).filter((i) => i !== prev && adj(pos[i], empty)); const i = opts[Math.floor(Math.random() * opts.length)]; swap(i); prev = i; } } while (solved()); paint(); box.classList.remove("n4-done"); st.textContent = START; }; tiles.forEach((t, i) => t.addEventListener("click", () => move(i))); board.addEventListener("keydown", (e) => { const d = { ArrowLeft: 1, ArrowRight: -1, ArrowUp: 3, ArrowDown: -3 }[e.key]; if (!d) return; e.preventDefault(); const cell = empty + d; if (cell < 0 || cell > 8 || (Math.abs(d) === 1 && Math.floor(cell / 3) !== Math.floor(empty / 3))) return; const i = pos.indexOf(cell); move(i); tiles[i].focus(); }); mix.addEventListener("click", shuffle); shuffle(); } export default function NotFoundPuzzle() { const ref = useRef(null); useEffect(() => { const el = ref.current?.firstElementChild; return el ? setup(el) : undefined; }, []); return ( <>

Put the pieces in order

This page is missing some pieces.

We've searched every box in the toy shop. While it turns up, solve the puzzle or go back to the shop window.

Back to the shop window

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