Pulse: CSS Keyframe Animation | AI CSS Animations

Pulse

The element grows a little and shrinks back, over and over, like it is breathing fast. The plain pulse for a call to action or a new badge. One scale keyframe with a symmetric ease.

Also known as: pulse animation css, css pulsating animation, zoom in zoom out animation.

Pulse

Color Base size 16px Dark background

HTML

<div class="kfa-pulse">Pulse</div>

CSS

.kfa-pulse {
  --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-pulse-throb 1.6s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
@keyframes kfa-pulse-throb {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

@media (prefers-reduced-motion: reduce) {
  .kfa-pulse, .kfa-pulse *, .kfa-pulse::before, .kfa-pulse::after, .kfa-pulse *::before, .kfa-pulse *::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.

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