amis/scss/components/_spinner.scss

@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(359deg);
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(1turn);
  }
}

.is-spin {
  animation: spin 2s linear infinite;
}

.#{$ns}Spinner-overlay {
  position: absolute;
  z-index: 10;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: $Spinner-overlay-bg;
  transition: ease-out opacity 0.3s;

  opacity: 0;

  &.in {
    opacity: 1;
  }
}

.#{$ns}Spinner {
  width: $Spinner-width;
  height: $Spinner-height;
  transform: translateZ(0);
  display: inline-block;
  background: $Spinner-bg;
  background-size: 100%;

  &--lg {
    width: $Spinner--lg-width;
    height: $Spinner--lg-height;
  }

  &--sm {
    width: $Spinner--sm-width;
    height: $Spinner--sm-height;
  }

  transition: ease-out all 0.3s;

  &--icon {
    background: transparent;
    animation: spin 2s linear infinite;
    width: auto;
    height: auto;
  }
}

// 当启用 overlay 的时候，应该是居中模式。
.#{$ns}Spinner--overlay {
  position: absolute;
  z-index: 11;
  top: 50%;
  left: 50%;
  transform: translate3d(-50%, -50%, 0);
}

.#{$ns}Spinner--overlay.#{$ns}Spinner--lg {
  width: $Spinner--lg-width;
  height: $Spinner--lg-height;
  line-height: $Spinner--lg-height;
}

@include media-breakpoint-up(md) {
  .#{$ns}Layout .#{$ns}Page-body > .#{$ns}Spinner-overlay {
    left: $Layout-aside-width;
  }

  .#{$ns}Layout--folded .#{$ns}Page-body > .#{$ns}Spinner-overlay {
    left: $Layout-aside--folded-width;
  }
}