Urgencias · Diagnóstico 404
Esta página no tiene pulso.
Le hemos hecho todas las pruebas y no hay nada que hacer. Tú, en cambio, estás estupendamente.
Volver a recepciónHTML + CSS404
404 Clínica
La línea de un monitor cardíaco cruza la pantalla, late dos veces, dibuja un 404 enorme y se queda plana.
Ajustes
1x
Código
<!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 · Página no encontrada</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">Urgencias · Diagnóstico 404</span>
<h1 class="n4-title">Esta página no tiene pulso.</h1>
<p class="n4-sub">Le hemos hecho todas las pruebas y no hay nada que hacer. Tú, en cambio, estás estupendamente.</p>
<a class="n4-cta" href="/">Volver a recepción</a>
</div>
</main>
</body>
</html>
Prompt para IA
Pégalo en ChatGPT, Claude o Cursor y adaptará el bloque a tu proyecto con estos ajustes, aunque no uses React.
Más en 404
Dónde usarlo
La web de una clínica acumula enlaces rotos muy rápido: la ficha de un médico que ya no pasa consulta, un formulario de citas antiguo, la campaña de la gripe del año pasado. Quien llega ahí suele venir algo preocupado. Una página 404 personalizada y tranquila lo retiene y lo devuelve a recepción con un clic.
La broma del «sin pulso» funciona en una clínica dental, un fisio o una clínica privada con un tono cercano. Si es oncología o un hospital, cambia el título por algo más sobrio. Poner el teléfono de citas en el mensaje suele ser el cambio más útil.