Swinging Sign Button: CSS Button Style & Animation

Swinging Sign Button

A button that hangs from a nail on two strings like a shop sign. On hover it swings, loses energy in smaller arcs, then keeps a lazy sway. The pivot is transform-origin set above the button.

Also known as: hanging sign hover, pendulum swing animation, swing button css.

Color Base size 18px Dark background Hold hover state

HTML

<button class="btn-swinging-sign">We're open</button>

CSS

.btn-swinging-sign {
  --c: var(--btn-color, #3b82f6);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  font: 600 var(--btn-size, 18px)/1.2 system-ui, sans-serif;
  cursor: pointer;
  position: relative;
  margin-top: 1.8em;
  padding: 0.75em 1.7em;
  border: 2px solid color-mix(in srgb, var(--c) 70%, #000);
  border-radius: 0.5em;
  background: var(--c);
  color: #fff;
  transform-origin: 50% -1.5em;
  transition: transform 0.3s ease;}
.btn-swinging-sign::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 22%;
  right: 22%;
  height: 1.5em;
  background:
    linear-gradient(to bottom right, transparent calc(50% - 1px), color-mix(in srgb, var(--c) 70%, transparent) 0 calc(50% + 1px), transparent 0) left / 50% 100% no-repeat,
    linear-gradient(to bottom left, transparent calc(50% - 1px), color-mix(in srgb, var(--c) 70%, transparent) 0 calc(50% + 1px), transparent 0) right / 50% 100% no-repeat;
}
.btn-swinging-sign::after {
  content: "";
  position: absolute;
  bottom: calc(100% + 1.3em);
  left: 50%;
  width: 0.45em;
  height: 0.45em;
  margin-left: -0.225em;
  border-radius: 50%;
  background: color-mix(in srgb, var(--c) 60%, #000);
}
.btn-swinging-sign:is(:hover, :focus-visible) {
  animation:
    btn-swinging-sign-swing 1.4s ease-in-out both,
    btn-swinging-sign-sway 2.4s ease-in-out 1.4s infinite;
}
@keyframes btn-swinging-sign-swing {
  0%   { transform: rotate(0deg); }
  15%  { transform: rotate(11deg); }
  35%  { transform: rotate(-8deg); }
  55%  { transform: rotate(5deg); }
  75%  { transform: rotate(-3deg); }
  100% { transform: rotate(1.5deg); }
}
@keyframes btn-swinging-sign-sway {
  0%, 100% { transform: rotate(1.5deg); }
  50%      { transform: rotate(-1.5deg); }
}

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

Customizing this snippet

Color: set --btn-color on the element or a parent. Currently previewing #3b82f6.
Base size: set --btn-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 18px.
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.

Swinging Sign Button

HTML

CSS

Customizing this snippet

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