# Hotel 404 > The brass key of room 404 hangs from its hook, swaying gently while a glint runs across the fob. - Category: [404](https://library.aimran.es/components/404) - Built with: HTML + CSS - Live editor: https://library.aimran.es/blocks/404-hotel - Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham ## Where to use it People booking a hotel usually have five tabs open and compare prices between them. If an old offer or a room page from a booking platform leads to a broken link, that tab gets closed first. A hotel 404 page that still looks like your lobby buys you a second chance before they book elsewhere. Send the button to your booking engine rather than the home page, since that is what the guest was looking for. The burgundy and brass feel like a classic or boutique hotel. For a surf hostel, change the colours or pick a lighter design. ## Code ### HTML ```html 404 · Page not found
Floor 4 · Room 404

Room 404 doesn’t exist.

We have the key, but the door isn’t on any corridor. Reception will point you the right way.

Back to reception
``` ### CSS ```css .n4-hotel { --accent: #d9b168; --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-hotel *,.n4-hotel *::before,.n4-hotel *::after { box-sizing: border-box; } .n4-hotel .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-hotel .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-hotel .n4-sub { margin: 0; max-width: 34em; font-size: clamp(13px,2.4cqmin,18px); color: #a1a1a6; text-wrap: balance; } .n4-hotel .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-hotel .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-hotel .n4-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px -10px var(--accent); } .n4-hotel .n4-cta:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-hotel .n4-stars,.n4-hotel .n4-stars2 { position: absolute; inset: -4%; pointer-events: none; } .n4-hotel .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-hotel-tw calc(5s / var(--k)) ease-in-out infinite alternate; } .n4-hotel .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-hotel-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse; } .n4-hotel [data-depth] { transition: transform .9s cubic-bezier(.2,.7,.2,1); } @keyframes n4-hotel-tw { from { opacity: .3; } } @keyframes n4-hotel-spin { to { transform: rotate(1turn); } } @keyframes n4-hotel-fade { from { opacity: 0; transform: translateY(10px); } } @media (prefers-reduced-motion:reduce) { .n4-hotel *,.n4-hotel *::before,.n4-hotel *::after { animation: none!important; transition: none!important; } } .n4-hotel { background: radial-gradient(46cqmin 40cqmin at 50% 28%,rgba(255,196,120,.16),transparent 70%),radial-gradient(90% 70% at 50% 30%,#4a1220,#1f060c 72%,#140307); color: #f7ead6; } .n4-hotel .n4-key { flex: none; width: auto; height: clamp(240px,44cqmin,360px); margin-bottom: 1.6cqmin; overflow: visible; filter: drop-shadow(0 2.4cqmin 2.4cqmin rgba(0,0,0,.55)); animation: n4-hotel-drop calc(1.2s / var(--k)) cubic-bezier(.2,.8,.2,1) both; } .n4-hotel .n4-swing { transform-box: view-box; transform-origin: 100px 12px; animation: n4-hotel-swing calc(3.2s / var(--k)) ease-in-out infinite alternate; } .n4-hotel .n4-num { font: 700 38px/1 "Baskerville","Libre Baskerville","Big Caslon",Georgia,serif; fill: #4a2e06; } .n4-hotel .n4-no { font: 600 6.4px/1 "Baskerville","Libre Baskerville","Big Caslon",Georgia,serif; letter-spacing: 1.6px; fill: #4a2e06; fill-opacity: .75; } .n4-hotel .n4-hi { fill: #fff3cf; fill-opacity: .5; } .n4-hotel .n4-shine { animation: n4-hotel-shine calc(5s / var(--k)) ease-in-out infinite; } .n4-hotel .n4-tag { color: var(--accent); } .n4-hotel .n4-title { font-family: "Baskerville","Libre Baskerville","Big Caslon",Georgia,serif; font-weight: 600; font-size: clamp(24px,6cqmin,52px); letter-spacing: -.01em; } .n4-hotel .n4-sub { color: #c9ab9c; } .n4-hotel .n4-cta { background: linear-gradient(180deg,#f6dc9a,var(--accent) 55%,#b8862f); color: #2a0911; box-shadow: inset 0 1px 0 rgba(255,255,255,.6),0 .6cqmin 1.6cqmin rgba(0,0,0,.4); } .n4-hotel .n4-copy>:not(.n4-key) { animation: n4-hotel-fade calc(1s / var(--k)) calc(.5s / var(--k)) cubic-bezier(.2,.7,.2,1) both; } @keyframes n4-hotel-drop { from { opacity: 0; transform: translateY(-4cqmin); } } @keyframes n4-hotel-swing { from { transform: rotate(4deg); } to { transform: rotate(-4deg); } } @keyframes n4-hotel-shine { 0%,55% { transform: rotate(18deg) translateX(-90px); } 100% { transform: rotate(18deg) translateX(110px); } } ``` ### React ```tsx const css = ` .n4-hotel { --accent: #d9b168; --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-hotel *,.n4-hotel *::before,.n4-hotel *::after { box-sizing: border-box; } .n4-hotel .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-hotel .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-hotel .n4-sub { margin: 0; max-width: 34em; font-size: clamp(13px,2.4cqmin,18px); color: #a1a1a6; text-wrap: balance; } .n4-hotel .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-hotel .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-hotel .n4-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px -10px var(--accent); } .n4-hotel .n4-cta:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-hotel .n4-stars,.n4-hotel .n4-stars2 { position: absolute; inset: -4%; pointer-events: none; } .n4-hotel .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-hotel-tw calc(5s / var(--k)) ease-in-out infinite alternate; } .n4-hotel .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-hotel-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse; } .n4-hotel [data-depth] { transition: transform .9s cubic-bezier(.2,.7,.2,1); } @keyframes n4-hotel-tw { from { opacity: .3; } } @keyframes n4-hotel-spin { to { transform: rotate(1turn); } } @keyframes n4-hotel-fade { from { opacity: 0; transform: translateY(10px); } } @media (prefers-reduced-motion:reduce) { .n4-hotel *,.n4-hotel *::before,.n4-hotel *::after { animation: none!important; transition: none!important; } } .n4-hotel { background: radial-gradient(46cqmin 40cqmin at 50% 28%,rgba(255,196,120,.16),transparent 70%),radial-gradient(90% 70% at 50% 30%,#4a1220,#1f060c 72%,#140307); color: #f7ead6; } .n4-hotel .n4-key { flex: none; width: auto; height: clamp(240px,44cqmin,360px); margin-bottom: 1.6cqmin; overflow: visible; filter: drop-shadow(0 2.4cqmin 2.4cqmin rgba(0,0,0,.55)); animation: n4-hotel-drop calc(1.2s / var(--k)) cubic-bezier(.2,.8,.2,1) both; } .n4-hotel .n4-swing { transform-box: view-box; transform-origin: 100px 12px; animation: n4-hotel-swing calc(3.2s / var(--k)) ease-in-out infinite alternate; } .n4-hotel .n4-num { font: 700 38px/1 "Baskerville","Libre Baskerville","Big Caslon",Georgia,serif; fill: #4a2e06; } .n4-hotel .n4-no { font: 600 6.4px/1 "Baskerville","Libre Baskerville","Big Caslon",Georgia,serif; letter-spacing: 1.6px; fill: #4a2e06; fill-opacity: .75; } .n4-hotel .n4-hi { fill: #fff3cf; fill-opacity: .5; } .n4-hotel .n4-shine { animation: n4-hotel-shine calc(5s / var(--k)) ease-in-out infinite; } .n4-hotel .n4-tag { color: var(--accent); } .n4-hotel .n4-title { font-family: "Baskerville","Libre Baskerville","Big Caslon",Georgia,serif; font-weight: 600; font-size: clamp(24px,6cqmin,52px); letter-spacing: -.01em; } .n4-hotel .n4-sub { color: #c9ab9c; } .n4-hotel .n4-cta { background: linear-gradient(180deg,#f6dc9a,var(--accent) 55%,#b8862f); color: #2a0911; box-shadow: inset 0 1px 0 rgba(255,255,255,.6),0 .6cqmin 1.6cqmin rgba(0,0,0,.4); } .n4-hotel .n4-copy>:not(.n4-key) { animation: n4-hotel-fade calc(1s / var(--k)) calc(.5s / var(--k)) cubic-bezier(.2,.7,.2,1) both; } @keyframes n4-hotel-drop { from { opacity: 0; transform: translateY(-4cqmin); } } @keyframes n4-hotel-swing { from { transform: rotate(4deg); } to { transform: rotate(-4deg); } } @keyframes n4-hotel-shine { 0%,55% { transform: rotate(18deg) translateX(-90px); } 100% { transform: rotate(18deg) translateX(110px); } } `; export default function NotFoundHotel() { return ( <>
Floor 4 · Room 404

Room 404 doesn’t exist.

We have the key, but the door isn’t on any corridor. Reception will point you the right way.

Back to reception
); } ``` ## 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 “Hotel 404” block (404) from AIMRAN Library to my project. ## What it is The brass key of room 404 hangs from its hook, swaying gently while a glint runs across the fob. ## Chosen settings - Accent color: #d9b168 - Speed: 1x (from 0.5 to 2x) - Title: "Room 404 doesn’t exist." - Message: "We have the key, but the door isn’t on any corridor. Reception will point you the right way." - Button: "Back to reception" ## 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 const css = ` .n4-hotel { --accent: #d9b168; --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-hotel *,.n4-hotel *::before,.n4-hotel *::after { box-sizing: border-box; } .n4-hotel .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-hotel .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-hotel .n4-sub { margin: 0; max-width: 34em; font-size: clamp(13px,2.4cqmin,18px); color: #a1a1a6; text-wrap: balance; } .n4-hotel .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-hotel .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-hotel .n4-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px -10px var(--accent); } .n4-hotel .n4-cta:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .n4-hotel .n4-stars,.n4-hotel .n4-stars2 { position: absolute; inset: -4%; pointer-events: none; } .n4-hotel .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-hotel-tw calc(5s / var(--k)) ease-in-out infinite alternate; } .n4-hotel .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-hotel-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse; } .n4-hotel [data-depth] { transition: transform .9s cubic-bezier(.2,.7,.2,1); } @keyframes n4-hotel-tw { from { opacity: .3; } } @keyframes n4-hotel-spin { to { transform: rotate(1turn); } } @keyframes n4-hotel-fade { from { opacity: 0; transform: translateY(10px); } } @media (prefers-reduced-motion:reduce) { .n4-hotel *,.n4-hotel *::before,.n4-hotel *::after { animation: none!important; transition: none!important; } } .n4-hotel { background: radial-gradient(46cqmin 40cqmin at 50% 28%,rgba(255,196,120,.16),transparent 70%),radial-gradient(90% 70% at 50% 30%,#4a1220,#1f060c 72%,#140307); color: #f7ead6; } .n4-hotel .n4-key { flex: none; width: auto; height: clamp(240px,44cqmin,360px); margin-bottom: 1.6cqmin; overflow: visible; filter: drop-shadow(0 2.4cqmin 2.4cqmin rgba(0,0,0,.55)); animation: n4-hotel-drop calc(1.2s / var(--k)) cubic-bezier(.2,.8,.2,1) both; } .n4-hotel .n4-swing { transform-box: view-box; transform-origin: 100px 12px; animation: n4-hotel-swing calc(3.2s / var(--k)) ease-in-out infinite alternate; } .n4-hotel .n4-num { font: 700 38px/1 "Baskerville","Libre Baskerville","Big Caslon",Georgia,serif; fill: #4a2e06; } .n4-hotel .n4-no { font: 600 6.4px/1 "Baskerville","Libre Baskerville","Big Caslon",Georgia,serif; letter-spacing: 1.6px; fill: #4a2e06; fill-opacity: .75; } .n4-hotel .n4-hi { fill: #fff3cf; fill-opacity: .5; } .n4-hotel .n4-shine { animation: n4-hotel-shine calc(5s / var(--k)) ease-in-out infinite; } .n4-hotel .n4-tag { color: var(--accent); } .n4-hotel .n4-title { font-family: "Baskerville","Libre Baskerville","Big Caslon",Georgia,serif; font-weight: 600; font-size: clamp(24px,6cqmin,52px); letter-spacing: -.01em; } .n4-hotel .n4-sub { color: #c9ab9c; } .n4-hotel .n4-cta { background: linear-gradient(180deg,#f6dc9a,var(--accent) 55%,#b8862f); color: #2a0911; box-shadow: inset 0 1px 0 rgba(255,255,255,.6),0 .6cqmin 1.6cqmin rgba(0,0,0,.4); } .n4-hotel .n4-copy>:not(.n4-key) { animation: n4-hotel-fade calc(1s / var(--k)) calc(.5s / var(--k)) cubic-bezier(.2,.7,.2,1) both; } @keyframes n4-hotel-drop { from { opacity: 0; transform: translateY(-4cqmin); } } @keyframes n4-hotel-swing { from { transform: rotate(4deg); } to { transform: rotate(-4deg); } } @keyframes n4-hotel-shine { 0%,55% { transform: rotate(18deg) translateX(-90px); } 100% { transform: rotate(18deg) translateX(110px); } } `; export default function NotFoundHotel() { return ( <>
Floor 4 · Room 404

Room 404 doesn’t exist.

We have the key, but the door isn’t on any corridor. Reception will point you the right way.

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