Modern CSS Animations

Keyframe animations for cards, icons, loaders and headings - drop a class on an element and it comes alive.

1Typewriter

Types a single line of monospace text letter by letter with a blinking caret; set --fx-ch to the character count. Class: fx-typewriter

terminal

Deploy complete

<div class="d-flex flex-wrap align-items-center justify-content-center gap-3 p-3 h-100" style="min-height:200px">
  <div class="bg-dark text-white rounded-3 p-3 w-100" style="max-width:18rem">
    <div class="small text-white-50 mb-1">
      terminal
    </div>
    <span class="fx-typewriter" style="--fx-ch:15">Deploy complete</span>
  </div>
</div>

/* CSS (already in assets/css/effects.css) */
.fx-typewriter {
  display: inline-block; max-width: 100%; overflow: hidden; white-space: nowrap; vertical-align: bottom;
  font-family: var(--bs-font-monospace, monospace);
  width: calc(var(--fx-ch, 20) * 1ch + .15em);
  border-right: .12em solid var(--wt-primary);
  animation: fx-typewriter-type 4.5s steps(var(--fx-ch, 20)) infinite, fx-typewriter-caret .8s step-end infinite;
}
@keyframes fx-typewriter-type { 0% { width: 0; } 65%, 100% { width: calc(var(--fx-ch, 20) * 1ch + .15em); } }
@keyframes fx-typewriter-caret { 50% { border-color: transparent; } }
@media (prefers-reduced-motion: reduce) {
  .fx-typewriter, .fx-typewriter::before, .fx-typewriter::after, .fx-typewriter *, .fx-typewriter *::before, .fx-typewriter *::after { animation: none !important; transition: none !important; }
}

2Heartbeat

A double-beat pulse for like buttons, favourite icons and notification badges. Class: fx-heartbeat

<div class="d-flex flex-wrap align-items-center justify-content-center gap-3 p-3 h-100" style="min-height:200px">
  <span class="display-4 text-danger fx-heartbeat"><i class="bi bi-heart-fill" aria-hidden="true"></i></span> 
  <button type="button" class="btn btn-outline-danger rounded-pill"><span class="fx-heartbeat"><i class="bi bi-heart-fill" aria-hidden="true"></i></span> 753 likes</button>
</div>

/* CSS (already in assets/css/effects.css) */
.fx-heartbeat { display: inline-block; animation: fx-heartbeat-beat 1.5s ease-in-out infinite; transform-origin: center; }
@keyframes fx-heartbeat-beat {
  0%, 40%, 100% { transform: scale(1); }
  12% { transform: scale(1.2); }
  24% { transform: scale(.96); }
  32% { transform: scale(1.14); }
}
@media (prefers-reduced-motion: reduce) {
  .fx-heartbeat, .fx-heartbeat::before, .fx-heartbeat::after, .fx-heartbeat *, .fx-heartbeat *::before, .fx-heartbeat *::after { animation: none !important; transition: none !important; }
}

3Shimmer Skeleton

Loading placeholders with a light sweep; add the class to every grey block of a skeleton card. Class: fx-shimmer-skeleton

<div class="d-flex flex-wrap align-items-center justify-content-center gap-3 p-3 h-100" style="min-height:200px">
  <div class="card w-100" style="max-width:18rem" aria-busy="true" aria-label="Loading content">
    <div class="card-body">
      <div class="d-flex align-items-center gap-3 mb-3">
        <span class="fx-shimmer-skeleton rounded-circle flex-shrink-0" style="width:48px;height:48px"></span> 
        <div class="flex-grow-1">
          <span class="fx-shimmer-skeleton mb-2" style="width:70%"></span><span class="fx-shimmer-skeleton" style="width:45%"></span>
        </div>
      </div>
      <span class="fx-shimmer-skeleton mb-2" style="height:70px"></span> <span class="fx-shimmer-skeleton mb-2"></span> <span class="fx-shimmer-skeleton" style="width:60%"></span> 
    </div>
  </div>
</div>

/* CSS (already in assets/css/effects.css) */
.fx-shimmer-skeleton {
  display: block; min-height: .9rem; border-radius: var(--wt-radius, .5rem);
  background: linear-gradient(90deg, rgba(var(--wt-primary-rgb), .08) 25%, rgba(var(--wt-primary-rgb), .22) 37%, rgba(var(--wt-primary-rgb), .08) 63%);
  background-size: 400% 100%;
  animation: fx-shimmer-skeleton-shine 1.4s ease infinite;
}
@keyframes fx-shimmer-skeleton-shine { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }
@media (prefers-reduced-motion: reduce) {
  .fx-shimmer-skeleton, .fx-shimmer-skeleton::before, .fx-shimmer-skeleton::after, .fx-shimmer-skeleton *, .fx-shimmer-skeleton *::before, .fx-shimmer-skeleton *::after { animation: none !important; transition: none !important; }
}