Attention
Floating Animation
A slow vertical float for hero images and decorative elements.
Opens with this animation loaded. Nothing is uploaded — the scene travels in the link.
.float {
transform: translate3d(180px, 100px, 0);
width: 120px;
height: 120px;
background: #6366f1;
border-radius: 20px;
animation: float-anim 2400ms linear 0ms infinite both;
will-change: transform, opacity;
}
@keyframes float-anim {
0% {
transform: translate3d(180px, 100px, 0);
animation-timing-function: ease-in-out;
}
50% {
transform: translate3d(180px, 82px, 0);
animation-timing-function: ease-in-out;
}
100% {
transform: translate3d(180px, 100px, 0);
}
}
@media (prefers-reduced-motion: reduce) {
.float {
animation: none;
transition: none;
}
}Why it is built this way
Slow and small: a couple of seconds and under 20px. This is ambient motion, so it should be something you notice only when you look for it. Use ease-in-out so there is no visible stop at either end of the travel.
What it animates
1 property across 1 CSS declaration. The bar shows when each one is moving.
transformWhat it costs to run
Y is handled by the compositor: no layout, no repaint, and the work can run off the main thread. This is the cheap end of CSS animation, which is why it stays smooth on a slow phone where other properties will not.
It runs for 2.40s across 3 keyframe stops, with every property moving over the same window.
One curve throughout: Ease In Out on a plain box. Keeping a single easing across every property is what makes a multi-property animation read as one movement rather than several things happening at once.
Accessibility
Nothing here hides content — y moves over 2.40s and the element is visible throughout. The exported prefers-reduced-motion guard still silences it, which matters most for the looping ones: motion that never stops is the kind that makes people feel unwell.