Animated Menu Bar | Learning Axis

HTML

CSS

@layer base {
  html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: system-ui;
  }
  main {
    background: black;
    height: 100%;
    display: grid;
    place-items: center;
    background: #21212a;
    color: white;
    text-align: center;
  }
  nav {
    background-color: #111;
    color: #eee;
    border-radius: 1.25rem;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
  }
  a {
    padding: 0.5rem 1rem;
    position: relative;
    color: white;
    isolation: isolate;
    text-decoration: none;
    &.active {
      &::before {
        content: "";
        position: absolute;
        inset: 0;
        background-image: linear-gradient(to right, #6a11cb 0%, #2575fc 100%);
        z-index: -1;
        border-radius: 0.75rem;
      }
    }
  }
}
@layer demo {
  :root {
    --bounce: linear(
      0,
      1 37.8%,
      0.883 44.2%,
      0.855 47.1%,
      0.846 50%,
      0.853 52.7%,
      0.875 55.5%,
      1 65.5%,
      0.967 69.4%,
      0.957 73.1%,
      0.964 76.5%,
      1 84.5%,
      0.993 89.3%,
      1
    );
  }
  a {
    view-transition-class: nav-item;
  }
  a.active::before {
    view-transition-name: active-nav-elem;
  }
  ::view-transition-old(active-nav-elem),
  ::view-transition-new(active-nav-elem) {
    height: 100%;
  }
  ::view-transition-group(.nav-item) {
    z-index: 1;
  }
  ::view-transition-group(active-nav-elem) {
    animation-timing-function: var(--bounce);
    animation-duration: 0.375s;
  }