@delon/theme/layout-default/style/_progress-bar.less

ng-alain theme system library.

@{alain-default-prefix}__progress-bar {
  position: fixed;
  z-index: @zindex-base + 20;
  overflow: hidden;
  width: 100vw;
  height: 4px;
  background: fade(#ddd, 40%);

  &::after {
    content: ' ';
    transform-origin: top left;
    display: block;
    width: 33.3vw;
    height: 100%;
    animation:
      gradcolours 5s steps(1) infinite,
      loadthird 1s infinite linear;
  }
}

.grad(@hex) {
  background: linear-gradient(90deg, fade(@hex, 0) 0%, @hex 30%, @hex 50%, @hex 70%, fade(@hex, 0) 100%);
}

@keyframes loadthird {
  0% {
    transform: translateX(-33.3vw);
  }

  100% {
    transform: translateX(100vw);
  }
}

@keyframes gradcolours {
  0% {
    .grad(#e88098);
  }

  20% {
    .grad(#84bebe);
  }

  40% {
    .grad(#e98724);
  }

  60% {
    .grad(#afc94e);
  }

  80% {
    .grad(#6297a4);
  }
}