src/styles/components/color-picker.less

@color-picker-prefix-cls: ~"@{css-prefix}color-picker";
.@{color-picker-prefix-cls} {
    &-rel{
        line-height: 0;
    }
    &-color{
        width: 18px;
        height: 18px;
        border: 1px solid @text-color;
        position: relative;
        top: 2px;
    }
    &-large &-color{
        width: 20px;
        height: 20px;
        top: 1px;
    }
    &-small &-color{
        width: 14px;
        height: 14px;
        top: 3px;
    }
}