Scale Up Center: CSS Keyframe Animation

Scale Up Center

Pops from half size to full with no fade, on an ease-out back curve that overshoots by a few percent. Snappy enough for badges, buttons, modals and new list items.

Also known as: pop in animation css, scale up animation css, pop up effect css.

Pop

Color Base size 16px Dark background

HTML

<div class="kfa-scale-up-center">Pop</div>

CSS

.kfa-scale-up-center {
  --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);
  animation: kfa-scale-up-center-kf 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
@keyframes kfa-scale-up-center-kf {
  from { transform: scale(0.5); }
  to { transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  .kfa-scale-up-center, .kfa-scale-up-center *, .kfa-scale-up-center::before, .kfa-scale-up-center::after, .kfa-scale-up-center *::before, .kfa-scale-up-center *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

Customizing this snippet

Color: set --kfa-color on the element or a parent. Currently previewing #3b82f6.
Base size: set --kfa-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 16px.
Speed: change the duration on the transition or animation shorthand. 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.

Scale Up Center

HTML

CSS

Customizing this snippet

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