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Overlay — drawer push
Variant: Drawer push
A side panel that pushes instead of floats: the page yields 10px as the drawer arrives, both riding the same curve on the same clock so they read as one gesture. The push is the message — this panel shares a surface with the page rather than hovering above it. Ten pixels is enough to establish causality; more and the page reads as layout collapsing rather than making room. Use it for inspectors and detail rails that belong to the page beside them.
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 — drawer push</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 — every duration in the document runs off --t. */
--cycle: 5.6s;
--t: calc(var(--cycle) / var(--speed));
/* The iOS drawer curve: fast off the mark, long settle. */
--ease-accent: cubic-bezier(0.32, 0.72, 0, 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);
}
.frame {
position: relative;
width: clamp(240px, 50vw, 360px);
height: min(64vh, 66vw, 210px);
border-radius: calc(12px * var(--round));
background: var(--paper);
border: 1px solid color-mix(in srgb, var(--slate) 10%, transparent);
overflow: hidden;
}
/* The page yields 10px as the panel arrives — the push is the whole
message. A dialog floats above the page; this panel shares a surface
with it, and the page moving over proves it. Both ride the same
curve on the same clock, so they read as one gesture, not a panel
plus a coincidence. */
.page {
position: absolute;
inset: 0;
padding: 16px;
display: grid;
gap: 10px;
align-content: start;
animation: page-push var(--t) linear infinite;
}
@keyframes page-push {
0%,
8% {
transform: translateX(0);
animation-timing-function: var(--ease-accent);
}
14%,
55% {
transform: translateX(-10px);
animation-timing-function: var(--ease-accent);
}
59.6%,
100% {
transform: translateX(0);
}
}
.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;
}
/* Dim, don't shove: 10px of travel is enough to establish causality.
More and the page starts to read as layout collapsing rather than
making room. The scrim does the rest of the de-emphasis. */
.scrim {
position: absolute;
inset: 0;
background: color-mix(in srgb, var(--slate) 26%, transparent);
opacity: 0;
animation: scrim var(--t) linear infinite;
}
@keyframes scrim {
0%,
7.5% {
opacity: 0;
animation-timing-function: ease;
}
13.5%,
55.5% {
opacity: 1;
animation-timing-function: ease;
}
60%,
100% {
opacity: 0;
}
}
/* 336ms in, 258ms out, both on the drawer curve. The panel travels by
its own width — translateX(105%) — so the choreography is independent
of how wide it renders. */
.panel {
position: absolute;
top: 0;
right: 0;
bottom: 0;
width: 46%;
background: var(--ivory);
box-shadow: -10px 0 28px color-mix(in srgb, var(--slate) 14%, transparent);
padding: 14px;
display: grid;
gap: 9px;
align-content: start;
transform: translateX(105%);
animation: panel var(--t) linear infinite;
}
@keyframes panel {
0%,
8% {
transform: translateX(105%);
animation-timing-function: var(--ease-accent);
}
14%,
55% {
transform: translateX(0);
animation-timing-function: var(--ease-accent);
}
59.6%,
100% {
transform: translateX(105%);
}
}
.panel .title {
font-size: 12.5px;
font-weight: 600;
letter-spacing: -0.01em;
margin-bottom: 2px;
}
.panel .bar {
height: 8px;
}
.panel .chip {
width: 44%;
height: 20px;
border-radius: calc(6px * var(--round));
background: var(--clay);
margin-top: 4px;
}
@media (prefers-reduced-motion: reduce) {
/* No travel: panel and dim simply trade places with the resting page. */
.page {
animation: none;
transform: none;
}
.panel {
transform: translateX(0);
animation: panel-rm var(--t) linear infinite;
}
@keyframes panel-rm {
0%,
8% {
opacity: 0;
animation-timing-function: ease;
}
14%,
55.5% {
opacity: 1;
animation-timing-function: ease;
}
60%,
100% {
opacity: 0;
}
}
}
</style>
</head>
<body>
<div
class="frame"
role="img"
aria-label="A side drawer sliding in while the page shifts over to make room"
>
<div class="page">
<div class="head">
<span class="dot"></span>
<span class="bar" style="width: 36%"></span>
</div>
<span class="bar" style="width: 84%"></span>
<span class="bar" style="width: 70%"></span>
<span class="bar" style="width: 78%"></span>
<span class="bar" style="width: 52%"></span>
</div>
<div class="scrim"></div>
<div class="panel">
<span class="title">Details</span>
<span class="bar" style="width: 90%"></span>
<span class="bar" style="width: 68%"></span>
<span class="bar" style="width: 78%"></span>
<span class="chip"></span>
</div>
</div>
</body>
</html>
The variant family
Same idea, one axis moved. Compare them side by side before you commit.