Scale Up Bottom
Grows upward from its bottom edge with scaleY, overshoots and springs back, the way chart bars and bottom sheets rise. The origin at 50% 100% keeps the base planted.
Also known as: grow from bottom animation css, expand up animation, scale up vertical bottom.
Grow
HTML
<div class="kfa-scale-up-bottom">Grow</div>
CSS
.kfa-scale-up-bottom {
--c: var(--kfa-color, #3b82f6);
font-size: var(--kfa-size, 16px);
display: grid;
place-items: center;
width: 5.5em;
height: 5.5em;
border-radius: 1em;
background: var(--c);
color: #fff;
font-family: system-ui, sans-serif;
font-weight: 700;
box-shadow: 0 0.6em 1.4em -0.6em color-mix(in srgb, var(--c) 70%, transparent);
transform-origin: 50% 100%;
animation: kfa-scale-up-bottom-kf 0.8s both;
}
@keyframes kfa-scale-up-bottom-kf {
0% {
transform: scaleY(0);
animation-timing-function: cubic-bezier(0.33, 1, 0.68, 1);
}
50% {
transform: scaleY(1.12);
animation-timing-function: cubic-bezier(0.37, 0, 0.63, 1);
}
72% {
transform: scaleY(0.95);
animation-timing-function: cubic-bezier(0.37, 0, 0.63, 1);
}
88% {
transform: scaleY(1.02);
animation-timing-function: cubic-bezier(0.37, 0, 0.63, 1);
}
100% { transform: scaleY(1); }
}
@media (prefers-reduced-motion: reduce) {
.kfa-scale-up-bottom, .kfa-scale-up-bottom *, .kfa-scale-up-bottom::before, .kfa-scale-up-bottom::after, .kfa-scale-up-bottom *::before, .kfa-scale-up-bottom *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--kfa-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--kfa-size. Every other dimension is inem, so the whole thing scales together. Currently previewing16px. - Speed: change the duration on the
transitionoranimationshorthand. Staggered delays are relative, so they keep their rhythm. - Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.