ant-design/site/theme/static/colors.less

.color-palettes {
  margin: 0 1%;
}
.color-palette {
  margin: 45px 1%;
  width: 31%;
  display: inline-block;
  &-pick {
    text-align: center;
    font-size: 20px;
    margin-bottom: 8px;
  }
  &-picker {
    margin: 12px 0 24px;
    &-value {
      font-size: 13px;
      font-family: Consolas;
    }
  }
}

.main-color {
  &-item {
    cursor: pointer;
    height: 44px;
    line-height: 44px;
    padding: 0 12px;
    margin-right: 4px;
    transition: all .2s;
    position: relative;
    text-align: center;
    font-family: Consolas;
    font-size: 14px;
    &:first-child {
      border-radius: 4px 4px 0 0;
    }
    &:last-child {
      border-radius: 0 0 4px 4px;
    }
    &:hover {
      margin-right: -8px;
      border-radius: 0 4px 4px 0;
    }
  }
  &-item &-text {
    transition: all .3s;
    float: left;
  }
  &-item &-value {
    float: right;
    transform: scale(0.85);
    opacity: 0;
    position: relative;
    left: 3px;
    transition: all .3s;
  }
}

.color-title {
  margin: 0 0 24px;
  font-weight: 500;
  color: #5c6b77;
  font-size: 22px;
  text-transform: capitalize;
  text-align: center;
}

.color-description {
  font-size: 14px;
  font-weight: lighter;
  color: #777;
  display: block;
}

.main-color:hover {
  .main-color-value {
    opacity: 0.7;
    left: 0;
  }
}

.make-palatte(@color, @index: 1) when (@index <= 10) {
  .palatte-@{color}-@{index} {
    @background: "@{color}-@{index}";
    background: @@background;
  }
  .make-palatte(@color, (@index + 1));    // next iteration
}

@grey-1: #fbfbfb;
@grey-2: #f7f7f7;
@grey-3: #f5f5f5;
@grey-4: #e9e9e9;
@grey-5: #d9d9d9;
@grey-6: #bfbfbf;
@grey-7: #919191;
@grey-8: #5a5a5a;
@grey-9: #404040;
@grey-10: #222;

.main-color {
  .make-palatte(blue);
  .make-palatte(purple);
  .make-palatte(cyan);
  .make-palatte(green);
  .make-palatte(magenta);
  .make-palatte(red);
  .make-palatte(volcano);
  .make-palatte(orange);
  .make-palatte(gold);
  .make-palatte(yellow);
  .make-palatte(lime);
  .make-palatte(geekblue);
  .make-palatte(grey);
}