Advanced Animated Backgrounds

<section class="fx-bg-wave-blob bg-body border rounded-4 p-4 text-center d-flex flex-column justify-content-center" style="min-height:210px">
  <p class="small text-uppercase fw-semibold mb-1 text-body-secondary">Wave and blob</p>
  <h3 class="h4 fw-bold mb-2">Experiences people talk about</h3>
  <p class="small mb-3 text-body-secondary">Content stays readable on top of the moving background.</p>
  <div>
    <a href="#" class="btn btn-primary btn-sm">Get started</a>
  </div>
</section>

/* CSS (already in assets/css/effects.css) */
.fx-bg-wave-blob { position: relative; isolation: isolate; overflow: hidden; }
.fx-bg-wave-blob::before, .fx-bg-wave-blob::after { content: ""; position: absolute; pointer-events: none; z-index: -1; }
.fx-bg-wave-blob::before {
  width: 55%; aspect-ratio: 1; top: -25%; left: -12%;
  background: radial-gradient(circle at 50% 50%, rgba(var(--wt-primary-rgb), .32), transparent 68%);
  border-radius: 42% 58% 63% 37% / 41% 44% 56% 59%;
  animation: fx-bg-wave-blob-blob 14s ease-in-out infinite alternate;
}
.fx-bg-wave-blob::after {
  left: 0; right: 0; bottom: 0; height: 60px;
  background:
    radial-gradient(84px 18px at 50% 100%, rgba(var(--wt-primary-rgb), .2) 99%, transparent 101%) 0 100% / 160px 30px repeat-x,
    radial-gradient(118px 24px at 50% 100%, rgba(var(--wt-accent-rgb), .18) 99%, transparent 101%) 0 100% / 220px 40px repeat-x,
    linear-gradient(rgba(var(--wt-primary-rgb), .14), rgba(var(--wt-primary-rgb), .14)) 0 100% / 100% 12px no-repeat;
  animation: fx-bg-wave-blob-wave 9s linear infinite;
}
@keyframes fx-bg-wave-blob-blob {
  0% { transform: translate(0, 0) rotate(0deg); border-radius: 42% 58% 63% 37% / 41% 44% 56% 59%; }
  50% { border-radius: 70% 30% 46% 54% / 30% 39% 61% 70%; }
  100% { transform: translate(110%, 35%) rotate(60deg); border-radius: 30% 70% 70% 30% / 53% 30% 70% 47%; }
}
@keyframes fx-bg-wave-blob-wave { to { background-position: 160px 100%, -220px 100%, 0 100%; } }
@media (prefers-reduced-motion: reduce) {
  .fx-bg-wave-blob, .fx-bg-wave-blob::before, .fx-bg-wave-blob::after, .fx-bg-wave-blob *, .fx-bg-wave-blob *::before, .fx-bg-wave-blob *::after { animation: none !important; transition: none !important; }
}

<section class="fx-bg-shapes bg-body border rounded-4 p-4 text-center d-flex flex-column justify-content-center" style="min-height:210px">
  <p class="small text-uppercase fw-semibold mb-1 text-body-secondary">Floating shapes</p>
  <h3 class="h4 fw-bold mb-2">Talks, workshops and new friendships</h3>
  <p class="small mb-3 text-body-secondary">Content stays readable on top of the moving background.</p>
  <div>
    <a href="#" class="btn btn-primary btn-sm">Get started</a>
  </div>
</section>

/* CSS (already in assets/css/effects.css) */
.fx-bg-shapes { position: relative; isolation: isolate; overflow: hidden; }
.fx-bg-shapes::before, .fx-bg-shapes::after { content: ""; position: absolute; pointer-events: none; z-index: -1; }
.fx-bg-shapes::before, .fx-bg-shapes::after { inset: -10%; background-repeat: no-repeat; }
.fx-bg-shapes::before {
  background-image:
    radial-gradient(circle, transparent 0 38%, rgba(var(--wt-primary-rgb), .35) 40% 50%, transparent 52%),
    radial-gradient(circle, rgba(var(--wt-accent-rgb), .35) 0 48%, transparent 50%),
    conic-gradient(from 150deg at 50% 0, rgba(var(--wt-secondary-rgb), .3) 0 60deg, transparent 0);
  background-size: 90px 90px, 34px 34px, 70px 60px;
  background-position: 12% 22%, 82% 18%, 70% 82%;
  animation: fx-bg-shapes-float 12s ease-in-out infinite alternate;
}
.fx-bg-shapes::after {
  background-image:
    linear-gradient(rgba(var(--wt-secondary-rgb), .22), rgba(var(--wt-secondary-rgb), .22)),
    radial-gradient(circle, transparent 0 40%, rgba(var(--wt-accent-rgb), .3) 42% 52%, transparent 54%),
    radial-gradient(circle, rgba(var(--wt-primary-rgb), .3) 0 48%, transparent 50%);
  background-size: 38px 38px, 60px 60px, 22px 22px;
  background-position: 88% 62%, 22% 80%, 45% 12%;
  animation: fx-bg-shapes-turn 18s ease-in-out infinite alternate;
}
@keyframes fx-bg-shapes-float { to { transform: translate(3%, -5%) rotate(6deg); } }
@keyframes fx-bg-shapes-turn { to { transform: translate(-4%, 4%) rotate(-8deg); } }
@media (prefers-reduced-motion: reduce) {
  .fx-bg-shapes, .fx-bg-shapes::before, .fx-bg-shapes::after, .fx-bg-shapes *, .fx-bg-shapes *::before, .fx-bg-shapes *::after { animation: none !important; transition: none !important; }
}

<section class="fx-bg-parallax bg-body border rounded-4 p-4 text-center d-flex flex-column justify-content-center" style="min-height:210px">
  <p class="small text-uppercase fw-semibold mb-1 text-body-secondary">Parallax depth</p>
  <h3 class="h4 fw-bold mb-2">The event your calendar has been waiting for</h3>
  <p class="small mb-3 text-body-secondary">Content stays readable on top of the moving background.</p>
  <div>
    <a href="#" class="btn btn-primary btn-sm">Get started</a>
  </div>
</section>

/* CSS (already in assets/css/effects.css) */
.fx-bg-parallax { position: relative; isolation: isolate; overflow: hidden; }
.fx-bg-parallax::before, .fx-bg-parallax::after { content: ""; position: absolute; pointer-events: none; z-index: -1; }
.fx-bg-parallax::before {
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(var(--wt-primary-rgb), .35) 0 1px, transparent 1.5px),
    radial-gradient(circle, rgba(var(--wt-secondary-rgb), .4) 0 2px, transparent 2.5px);
  background-size: 24px 24px, 70px 70px;
  animation: fx-bg-parallax-layers 20s linear infinite;
}
.fx-bg-parallax::after {
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(var(--wt-accent-rgb), .22) 0 18px, transparent 32px),
    radial-gradient(circle, rgba(var(--wt-primary-rgb), .18) 0 26px, transparent 44px);
  background-size: 220px 220px, 340px 340px;
  background-position: 30px 60px, 180px 10px;
  animation: fx-bg-parallax-near 20s linear infinite;
}
@keyframes fx-bg-parallax-layers { to { background-position: -24px 0, -140px 0; } }
@keyframes fx-bg-parallax-near { to { background-position: -410px 60px, -500px 10px; } }
@media (prefers-reduced-motion: reduce) {
  .fx-bg-parallax, .fx-bg-parallax::before, .fx-bg-parallax::after, .fx-bg-parallax *, .fx-bg-parallax *::before, .fx-bg-parallax *::after { animation: none !important; transition: none !important; }
}