Urgencias · Diagnóstico 404
This page has no pulse.
We ran every test and there’s nothing more we can do. You, on the other hand, are doing great.
Back to receptionHTML + CSS404
Clinic 404
A heart monitor line crosses the screen, beats twice, draws a huge 404 and then goes flat.
Settings
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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-clinic {
--accent: #2dd4bf;
--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-clinic *,.n4-clinic *::before,.n4-clinic *::after {
box-sizing: border-box;
}
.n4-clinic .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-clinic .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-clinic .n4-sub {
margin: 0;
max-width: 34em;
font-size: clamp(13px,2.4cqmin,18px);
color: #a1a1a6;
text-wrap: balance;
}
.n4-clinic .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-clinic .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-clinic .n4-cta:hover {
transform: translateY(-2px);
box-shadow: 0 12px 32px -10px var(--accent);
}
.n4-clinic .n4-cta:focus-visible {
outline: 2px solid var(--accent);
outline-offset: 3px;
}
.n4-clinic .n4-stars,.n4-clinic .n4-stars2 {
position: absolute;
inset: -4%;
pointer-events: none;
}
.n4-clinic .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-clinic-tw calc(5s / var(--k)) ease-in-out infinite alternate;
}
.n4-clinic .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-clinic-tw calc(7s / var(--k)) ease-in-out infinite alternate-reverse;
}
.n4-clinic [data-depth] {
transition: transform .9s cubic-bezier(.2,.7,.2,1);
}
@keyframes n4-clinic-tw {
from {
opacity: .3;
}
}
@keyframes n4-clinic-spin {
to {
transform: rotate(1turn);
}
}
@keyframes n4-clinic-fade {
from {
opacity: 0;
transform: translateY(10px);
}
}
@media (prefers-reduced-motion:reduce) {
.n4-clinic *,.n4-clinic *::before,.n4-clinic *::after {
animation: none!important;
transition: none!important;
}
}
.n4-clinic {
background: radial-gradient(80% 60% at 50% 38%,#07302b,#021210 70%,#010807);
color: #eafffb;
}
.n4-clinic::before {
content: "";
position: absolute;
inset: 0;
background-image: linear-gradient(color-mix(in srgb,var(--accent) 7%,transparent) 1px,transparent 1px),linear-gradient(90deg,color-mix(in srgb,var(--accent) 7%,transparent) 1px,transparent 1px);
background-size: 5cqmin 5cqmin;
-webkit-mask: radial-gradient(circle at 50% 38%,#000 5%,transparent 70%);
mask: radial-gradient(circle at 50% 38%,#000 5%,transparent 70%);
}
.n4-clinic .n4-copy {
min-width: 0;
}
.n4-clinic .n4-ecg {
flex: none;
display: block;
width: max(100cqw,min(196cqmin,1300px));
height: auto;
margin-bottom: 1cqmin;
overflow: visible;
animation: n4-clinic-in calc(1s / var(--k)) ease-out both;
}
.n4-clinic .n4-ecg path {
fill: none;
stroke-linecap: round;
stroke-linejoin: round;
}
.n4-clinic .n4-base {
stroke: color-mix(in srgb,var(--accent) 38%,transparent);
stroke-width: 3.5;
}
.n4-clinic .n4-trail {
stroke: color-mix(in srgb,var(--accent) 70%,#fff);
stroke-width: 4.5;
filter: drop-shadow(0 0 4px var(--accent)) drop-shadow(0 0 12px color-mix(in srgb,var(--accent) 60%,transparent));
animation: n4-clinic-trail calc(5s / var(--k)) linear infinite;
}
.n4-clinic .n4-beam {
stroke: #fff;
stroke-width: 7;
filter: drop-shadow(0 0 4px #fff) drop-shadow(0 0 14px var(--accent));
animation: n4-clinic-beam calc(5s / var(--k)) linear infinite;
}
.n4-clinic .n4-title {
font-size: clamp(22px,5.6cqmin,48px);
font-weight: 700;
letter-spacing: -.03em;
}
.n4-clinic .n4-sub {
color: #8fb3ad;
}
.n4-clinic .n4-cta {
background: var(--accent);
color: #021210;
}
.n4-clinic .n4-copy>:not(.n4-ecg) {
animation: n4-clinic-fade calc(1s / var(--k)) calc(.4s / var(--k)) cubic-bezier(.2,.7,.2,1) both;
}
@keyframes n4-clinic-in {
from {
opacity: 0;
}
}
@keyframes n4-clinic-trail {
from {
stroke-dasharray: 180 3000;
stroke-dashoffset: 180;
}
to {
stroke-dasharray: 180 3000;
stroke-dashoffset: -1000;
}
}
@keyframes n4-clinic-beam {
from {
stroke-dasharray: 1 3000;
stroke-dashoffset: 1;
}
to {
stroke-dasharray: 1 3000;
stroke-dashoffset: -1000;
}
}
</style>
</head>
<body>
<main class="n4-clinic">
<div class="n4-copy">
<svg class="n4-ecg" viewBox="0 0 1200 300" aria-hidden="true">
<path class="n4-base" d="M0 150 H40 q10 -16 20 0 H86 l6 10 l9 -126 l10 150 l7 -34 H150 q18 -30 36 0 H232 q10 -16 20 0 H278 l6 10 l9 -126 l10 150 l7 -34 H342 q16 -26 32 0 H414 L484 40 V260 V150 H556 V100 C556 26 652 26 652 100 V200 C652 274 556 274 556 200 V150 V200 C556 274 652 274 652 200 V150 H716 L786 40 V260 V150 H1200"/>
<path class="n4-trail" pathLength="1000" d="M0 150 H40 q10 -16 20 0 H86 l6 10 l9 -126 l10 150 l7 -34 H150 q18 -30 36 0 H232 q10 -16 20 0 H278 l6 10 l9 -126 l10 150 l7 -34 H342 q16 -26 32 0 H414 L484 40 V260 V150 H556 V100 C556 26 652 26 652 100 V200 C652 274 556 274 556 200 V150 V200 C556 274 652 274 652 200 V150 H716 L786 40 V260 V150 H1200"/>
<path class="n4-beam" pathLength="1000" d="M0 150 H40 q10 -16 20 0 H86 l6 10 l9 -126 l10 150 l7 -34 H150 q18 -30 36 0 H232 q10 -16 20 0 H278 l6 10 l9 -126 l10 150 l7 -34 H342 q16 -26 32 0 H414 L484 40 V260 V150 H556 V100 C556 26 652 26 652 100 V200 C652 274 556 274 556 200 V150 V200 C556 274 652 274 652 200 V150 H716 L786 40 V260 V150 H1200"/>
</svg>
<span class="n4-tag">ER · Diagnosis 404</span>
<h1 class="n4-title">This page has no pulse.</h1>
<p class="n4-sub">We ran every test and there’s nothing more we can do. You, on the other hand, are doing great.</p>
<a class="n4-cta" href="/">Back to reception</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
Clinic websites collect dead links fast: the profile of a doctor who left, an old booking form, a leaflet about last winter’s flu jabs. Patients who land there are often a bit worried already. A calm, well made 404 page for a medical clinic keeps them on your site and sends them back to reception in one click.
The “no pulse” joke works for a dental practice, a physio or a private clinic with a friendly tone. For oncology or a hospital, rewrite the title in something plainer. Adding the appointment phone to the message is often the most useful change.