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Overlay — dialog pop
Variant: Dialog pop
A confirmation dialog arriving over a page. The scrim leads by a beat and does most of the work — it recolours everything behind it to say "this is inert now", so the panel only has to show up: scale from 0.96, never zero, centred because a dialog is anchored to nothing. The 179ms exit is faster than the 252ms enter, since leaving should never outstay the decision.
overlaytransitioncontrol
The source
A complete HTML document. Paste it into an empty .html file and it plays — no stylesheet, script, font, or image to fetch.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Overlay — dialog pop</title>
<style>
:root {
/* Neutrals — fixed, never remixed. */
--ivory: #faf9f5;
--paper: #ffffff;
--oat: #e3dacc;
--slate: #141413;
/* Knobs — the remix API. A knob exists iff declared here and used below. */
--hue: 38.8;
--lift: 0;
--chroma: 1;
--round: 1;
--speed: 1;
/* Accents — derived from the knobs with the family's offsets baked in,
so one hue roll moves them together. Defaults reproduce the original hex. */
--clay: oklch(calc(0.6724 + var(--lift)) calc(0.1308 * var(--chroma)) var(--hue));
--clay-d: oklch(calc(0.5797 + var(--lift)) calc(0.127 * var(--chroma)) var(--hue));
--olive: oklch(
calc(0.6118 + var(--lift)) calc(0.0713 * var(--chroma)) calc(var(--hue) + 88.3)
);
--rust: oklch(
calc(0.5408 + var(--lift)) calc(0.1357 * var(--chroma)) calc(var(--hue) - 10.3)
);
/* Clock — one cycle: enter, hold long enough to read, leave, rest.
Every duration in the document runs off --t. */
--cycle: 5.6s;
--t: calc(var(--cycle) / var(--speed));
--ease-out: cubic-bezier(0.23, 1, 0.32, 1);
}
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
min-height: 100vh;
display: grid;
place-items: center;
background: var(--ivory);
font-family:
system-ui,
-apple-system,
'Segoe UI',
Roboto,
sans-serif;
color: var(--slate);
}
/* The mini viewport the choreography happens inside. Everything is
clipped to it, so the animation reads at any stage size. */
.frame {
position: relative;
width: clamp(220px, 46vw, 340px);
height: min(68vh, 74vw, 230px);
border-radius: calc(12px * var(--round));
background: var(--paper);
border: 1px solid color-mix(in srgb, var(--slate) 10%, transparent);
overflow: hidden;
}
.page {
position: absolute;
inset: 0;
padding: 16px;
display: grid;
gap: 10px;
align-content: start;
}
.bar {
height: 10px;
border-radius: 5px;
background: var(--oat);
}
.page .head {
display: flex;
align-items: center;
gap: 8px;
margin-bottom: 4px;
}
.page .dot {
width: 14px;
height: 14px;
border-radius: 50%;
background: var(--clay);
flex: none;
}
/* The scrim carries most of the meaning: it recolours the whole page to
say "everything behind this is inert now". The panel only has to
arrive. It leads the panel by ~30ms so the room dims before the
thing enters it. */
.scrim {
position: absolute;
inset: 0;
background: color-mix(in srgb, var(--slate) 34%, transparent);
opacity: 0;
animation: scrim var(--t) linear infinite;
}
@keyframes scrim {
0%,
8% {
opacity: 0;
animation-timing-function: ease;
}
12.5%,
56% {
opacity: 1;
animation-timing-function: ease;
}
60.5%,
100% {
opacity: 0;
}
}
/* A dialog is anchored to nothing, so it scales from its own centre —
the one overlay where transform-origin: center is correct. It starts
at 0.96, never zero, and the 179ms exit is faster than the 252ms
enter: leaving should never outstay the decision. */
.dialog {
position: absolute;
left: 50%;
top: 50%;
width: min(72%, 220px);
transform: translate(-50%, -50%) scale(0.96);
opacity: 0;
background: var(--ivory);
border-radius: calc(10px * var(--round));
padding: 14px;
box-shadow: 0 12px 32px color-mix(in srgb, var(--slate) 18%, transparent);
animation: dialog var(--t) linear infinite;
}
@keyframes dialog {
0%,
8.5% {
opacity: 0;
transform: translate(-50%, -50%) scale(0.96);
animation-timing-function: var(--ease-out);
}
13%,
55.5% {
opacity: 1;
transform: translate(-50%, -50%) scale(1);
animation-timing-function: ease;
}
58.7%,
100% {
opacity: 0;
transform: translate(-50%, -50%) scale(0.97);
}
}
/* The copy rides in ~50ms behind the surface with a 3px rise — enough
that the panel visibly brings its contents, not enough to read as a
second entrance. */
.inner {
display: grid;
gap: 9px;
animation: inner var(--t) linear infinite;
}
@keyframes inner {
0%,
9.4% {
opacity: 0;
transform: translateY(3px);
animation-timing-function: var(--ease-out);
}
13.8%,
100% {
opacity: 1;
transform: translateY(0);
}
}
.dialog .title {
font-size: 12.5px;
font-weight: 600;
letter-spacing: -0.01em;
}
.dialog .bar {
height: 7px;
background: var(--oat);
}
.actions {
display: flex;
justify-content: flex-end;
gap: 6px;
margin-top: 3px;
}
.btn {
font-size: 11px;
font-weight: 550;
line-height: 1;
padding: 6px 10px;
border-radius: calc(6px * var(--round));
background: var(--oat);
}
.btn.primary {
background: var(--clay);
color: var(--ivory);
}
@media (prefers-reduced-motion: reduce) {
/* The states still trade places; only the travel and scale go. */
.dialog {
animation: dialog-rm var(--t) linear infinite;
}
.inner {
animation: none;
opacity: 1;
transform: none;
}
@keyframes dialog-rm {
0%,
8.5% {
opacity: 0;
transform: translate(-50%, -50%);
animation-timing-function: ease;
}
13%,
55.5% {
opacity: 1;
transform: translate(-50%, -50%);
animation-timing-function: ease;
}
58.7%,
100% {
opacity: 0;
transform: translate(-50%, -50%);
}
}
}
</style>
</head>
<body>
<div
class="frame"
role="img"
aria-label="A confirmation dialog opening over a page and closing again"
>
<div class="page">
<div class="head">
<span class="dot"></span>
<span class="bar" style="width: 42%"></span>
</div>
<span class="bar" style="width: 88%"></span>
<span class="bar" style="width: 74%"></span>
<span class="bar" style="width: 81%"></span>
<span class="bar" style="width: 56%"></span>
</div>
<div class="scrim"></div>
<div class="dialog">
<div class="inner">
<span class="title">Delete project?</span>
<span class="bar" style="width: 92%"></span>
<span class="bar" style="width: 64%"></span>
<div class="actions">
<span class="btn">Cancel</span>
<span class="btn primary">Delete</span>
</div>
</div>
</div>
</div>
</body>
</html>
The variant family
Same idea, one axis moved. Compare them side by side before you commit.