Bounce Up and Down: CSS Keyframe Animation

Bounce Up and Down

Falls fast, touches down and rises slowly, over and over, like a ball tapping the floor. The same curve as Tailwind's animate-bounce: an ease-in drop and an ease-out climb.

Also known as: css bounce up and down, infinite bounce animation, tailwind animate bounce.

Bounce

Color Base size 16px Dark background

HTML

<div class="kfa-bounce-up-and-down">Bounce</div>

CSS

.kfa-bounce-up-and-down {
  --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-bounce-up-and-down-hop 1s infinite;
}
@keyframes kfa-bounce-up-and-down-hop {
  0%, 100% { transform: translateY(-1.4em); animation-timing-function: cubic-bezier(0.8, 0, 1, 1); }
  50% { transform: translateY(0); animation-timing-function: cubic-bezier(0, 0, 0.2, 1); }
}

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

Tailwind CSS version

The same effect using Tailwind utility classes. No custom CSS or config needed.

<div class="grid h-[5.5em] w-[5.5em] animate-bounce place-items-center rounded-[1em] bg-blue-500 font-bold text-white">
  Bounce
</div>

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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