Control de misión · Canal 404
Signal lost
The module isn’t responding at this address. We recommend aborting and heading back to base.
Abort missionHTML + CSS404
Mission control 404
A green mission control terminal with a sweeping radar, a flickering 404 and a log that types itself.
Settings
1x
Code
<!doctype html>
<html lang="es">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="robots" content="noindex" />
<title>404 · Page not found</title>
<style>
body { margin: 0; background: #000; }
.n4-mission {
--accent: #30d158;
--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-mission *,.n4-mission *::before,.n4-mission *::after {
box-sizing: border-box;
}
.n4-mission .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-mission .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-mission .n4-sub {
margin: 0;
max-width: 34em;
font-size: clamp(13px,2.4cqmin,18px);
color: #a1a1a6;
text-wrap: balance;
}
.n4-mission .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-mission .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-mission .n4-cta:hover {
transform: translateY(-2px);
box-shadow: 0 12px 32px -10px var(--accent);
}
.n4-mission .n4-cta:focus-visible {
outline: 2px solid var(--accent);
outline-offset: 3px;
}
.n4-mission .n4-stars,.n4-mission .n4-stars2 {
position: absolute;
inset: -4%;
pointer-events: none;
}
.n4-mission .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-mission-tw calc(5s / var(--k)) ease-in-out infinite alternate;
}
.n4-mission .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-mission-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse;
}
.n4-mission [data-depth] {
transition: transform .9s cubic-bezier(.2,.7,.2,1);
}
@keyframes n4-mission-tw {
from {
opacity: .3;
}
}
@keyframes n4-mission-spin {
to {
transform: rotate(1turn);
}
}
@keyframes n4-mission-fade {
from {
opacity: 0;
transform: translateY(10px);
}
}
@media (prefers-reduced-motion:reduce) {
.n4-mission *,.n4-mission *::before,.n4-mission *::after {
animation: none!important;
transition: none!important;
}
}
.n4-mission {
font-family: ui-monospace,"SF Mono",Menlo,Consolas,monospace;
background: radial-gradient(80% 70% at 50% 45%,#04140a,#000 75%);
}
.n4-mission::after {
content: "";
position: absolute;
inset: 0;
z-index: 6;
pointer-events: none;
background: repeating-linear-gradient(transparent 0 2px,rgba(0,0,0,.28) 2px 3px);
}
.n4-mission .n4-grid {
position: absolute;
inset: 0;
background-image: linear-gradient(color-mix(in srgb,var(--accent) 9%,transparent) 1px,transparent 1px),linear-gradient(90deg,color-mix(in srgb,var(--accent) 9%,transparent) 1px,transparent 1px);
background-size: 5cqmin 5cqmin;
-webkit-mask: radial-gradient(circle at 50% 45%,#000,transparent 72%);
mask: radial-gradient(circle at 50% 45%,#000,transparent 72%);
}
.n4-mission .n4-copy {
gap: 2cqmin;
}
.n4-mission .n4-head {
display: flex;
align-items: center;
gap: 1.4cqmin;
}
.n4-mission .n4-radar {
position: relative;
width: clamp(18px,4cqmin,30px);
aspect-ratio: 1;
border-radius: 50%;
border: 1px solid color-mix(in srgb,var(--accent) 60%,transparent);
background: conic-gradient(from 0deg,color-mix(in srgb,var(--accent) 70%,transparent),transparent 30%);
animation: n4-mission-spin calc(2.4s / var(--k)) linear infinite;
}
.n4-mission .n4-num {
margin: 0;
font-size: clamp(76px,24cqmin,240px);
font-weight: 700;
line-height: 1;
letter-spacing: .02em;
color: var(--accent);
text-shadow: 0 0 .06em color-mix(in srgb,var(--accent) 80%,#fff),0 0 .3em color-mix(in srgb,var(--accent) 40%,transparent);
animation: n4-mission-flicker calc(5s / var(--k)) steps(1) infinite;
}
.n4-mission .n4-title {
font-size: clamp(16px,3.6cqmin,30px);
font-weight: 700;
text-transform: uppercase;
letter-spacing: .12em;
color: #eafff0;
}
.n4-mission .n4-log {
margin: 0;
padding: 0;
list-style: none;
display: flex;
flex-direction: column;
align-items: flex-start;
gap: .35em;
font-size: clamp(11px,2cqmin,15px);
color: color-mix(in srgb,var(--accent) 85%,#fff);
}
.n4-mission .n4-log li {
overflow: hidden;
white-space: nowrap;
animation: n4-mission-type calc(1.1s / var(--k)) steps(34,end) both;
}
.n4-mission .n4-log li:nth-child(2) {
animation-delay: calc(1.2s / var(--k));
}
.n4-mission .n4-log li:nth-child(3) {
animation-delay: calc(2.4s / var(--k));
}
.n4-mission .n4-log li:last-child::after {
content: "▌";
margin-left: .2em;
animation: n4-mission-blink 1s steps(1) infinite;
}
.n4-mission .n4-sub {
color: #7c8c80;
}
.n4-mission .n4-cta {
background: var(--accent);
color: #00160a;
font-family: inherit;
letter-spacing: .04em;
}
@keyframes n4-mission-flicker {
0%,100% {
opacity: 1;
}
42% {
opacity: .55;
}
43% {
opacity: 1;
}
78% {
opacity: .8;
}
79% {
opacity: 1;
}
}
@keyframes n4-mission-type {
from {
max-width: 0;
}
to {
max-width: 48ch;
}
}
@keyframes n4-mission-blink {
50% {
opacity: 0;
}
}
</style>
</head>
<body>
<main class="n4-mission">
<div class="n4-grid" aria-hidden="true"></div>
<div class="n4-copy">
<div class="n4-head"><span class="n4-radar" aria-hidden="true"></span><span class="n4-tag">Mission Control · Channel 404</span></div>
<p class="n4-num" aria-hidden="true">404</p>
<h1 class="n4-title">Signal lost</h1>
<ol class="n4-log" aria-hidden="true">
<li>> Buscando la ruta solicitada…</li>
<li>> Telemetría: 0 paquetes recibidos</li>
<li>> Estado: página fuera de órbita</li>
</ol>
<p class="n4-sub">The module isn’t responding at this address. We recommend aborting and heading back to base.</p>
<a class="n4-cta" href="/">Abort mission</a>
</div>
</main>
</body>
</html>
Prompt for AI
Paste it into ChatGPT, Claude or Cursor and it will adapt the block to your project with these settings, even if you don’t use React.
More in 404
Where to use it
Developers and technical users tend to enjoy a 404 that speaks their language. This one looks like an old monitor in a control room, scan lines included, and the log reads like telemetry from a lost module. It fits a hosting company, a dev tools startup or an engineering blog that wants a terminal-style 404 page.
Green on black is part of the charm, but you can switch the accent to amber or cyan if your brand leans that way. Keep the message short: the log already sets the scene, and a long paragraph under it breaks the effect.