ant-design/components/switch/style/index.less

@import "../../style/themes/default";
@import "../../style/mixins/index";

@switch-prefix-cls: ant-switch;
@switch-duration: .3s;

.@{switch-prefix-cls} {
  position: relative;
  display: inline-block;
  box-sizing: border-box;
  width: 44px;
  height: 22px;
  line-height: 20px;
  vertical-align: middle;
  border-radius: 20px;
  border: 1px solid #ccc;
  background-color: #ccc;
  cursor: pointer;
  transition: all @switch-duration @ease-in-out-circ;
  user-select: none;

  &-inner {
    color: #fff;
    font-size: 12px;
    position: absolute;
    left: 24px;
  }

  &:after {
    position: absolute;
    width: 18px;
    height: 18px;
    left: 2px;
    top: 1px;
    border-radius: 18px;
    background-color: #fff;
    content: " ";
    cursor: pointer;
    transition: left @switch-duration @ease-in-out-circ, width @switch-duration @ease-in-out-circ;
  }

  &:active:after {
    width: 24px;
  }

  &:focus {
    box-shadow: 0 0 0 2px fade(@primary-color, 20%);
    outline: 0;
  }

  &:focus:hover {
    box-shadow: none;
  }

  &-small {
    height: 14px;
    line-height: 12px;
    width: 28px;
    &:after {
      width: 12px;
      height: 12px;
      top: 0;
      left: 0;
    }
    &:active:after {
      width: 16px;
    }
  }

  &-small&-checked:after {
    left: 14px;
  }

  &-small:active&-checked:after {
    left: 10px;
  }

  &-checked {
    border-color: @primary-color;
    background-color: @primary-color;

    .@{switch-prefix-cls}-inner {
      left: 6px;
    }

    &:after {
      left: 22px;
    }

    &:active:after {
      left: 16px;
    }
  }

  &-disabled {
    cursor: not-allowed;
    background: #f4f4f4;
    border-color: #f4f4f4;

    &:after {
      background: #ccc;
      cursor: not-allowed;
    }

    .@{switch-prefix-cls}-inner {
      color: #ccc;
    }
  }
}