ant-design/style/components/spin.less

@spin-prefix-cls: ant-spin;
@spin-dot-default            : #999;
@spin-dot-size               : 8px;
@spin-dot-size-sm            : @spin-dot-size / 2;
@spin-dot-size-lg            : @spin-dot-size * 2;

// root of component
// ------------------------------

.@{spin-prefix-cls} {
  color: @primary-color;
  display: inline-block;
  font-size: @spin-dot-size;
  text-align: center;
  opacity: 0;
  position: absolute;
  visibility: hidden;
  transition: opacity 0.3s @ease-in-out-circ;

  &-spining {
    opacity: 1;
    position: static;
    visibility: visible;
  }

  &-nested-loading {
    position: relative;
  }

  &-nested-loading & {
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -0.75em;
    margin-left: -2.5em;
    z-index: 4;
  }

  &-container {
    transition: all 0.3s @ease-in-out-circ;
  }

  &-nested-loading > &-container {
    opacity: 0.7;
    filter: blur(1px);
    filter: ~"progid\:DXImageTransform\.Microsoft\.Blur(PixelRadius\=1, MakeShadow\=false)"; /* IE6~IE9 */
    pointer-events: none;
  }

  // dots
  // ------------------------------

  &-dot {
    .animation(antSpinPulse 1.2s infinite @ease-in-out-circ);
    .square(1em);
    border-radius: 50%;
    display: inline-block;
    background-color: @primary-color;
  }
  &-dot-second {
    .animation-delay(200ms);
    margin-left: 1em;
  }
  &-dot-third {
    .animation-delay(400ms);
    margin-left: 1em;
  }

  // Sizes
  // ------------------------------
  // small
  &-sm {
    font-size: @spin-dot-size-sm;
  }

  // large
  &-lg {
    font-size: @spin-dot-size-lg;
  }
}

// pulse
@keyframes antSpinPulse {
  0%,
  80%,
  100% {
    opacity: 0;
  }
  40% {
    opacity: 1;
  }
}

@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
  /* IE10+*/
  .ant-spin-nested-loading > .ant-spin-container {
    background: #fff;
    opacity: 0.5;
  }
}