Theme prefixes with icons

[ROOT]

We add to extra.less, better by modification, I will not explain here, and so everyone is smart

@svgPrefixBorderRadius: @xf-borderRadiusSmall; // Радиус префиксов
@svgPrefixFontFamily: inherit;                 // Семейство шрифта префикса
@svgPrefixColorGradient: rgba(0,0,0,.4);       // Цвет градиента прификса
@svgPrefixTextShadow: rgba(0,0,0,.5);          // Цвет тени префикса

.svgLabelPrefix(@prefix-name, @prefix-color, @prefix-icon: "none") {
    .svgPrefix, .label.svgPrefix {
        font-family: @svgPrefixFontFamily;
        font-size: 70%;
        font-weight: 500;
        display: inline-flex;
        text-align: center;
        align-items: center;
        text-transform: uppercase;
        line-height: ((@xf-lineHeightDefault) * .9);
        padding: .25em .5em;
        border: none;
        border-radius: @svgPrefixBorderRadius;
        position: relative;
        white-space: nowrap;
        .fsp & {
            margin-right: 5px;
        }
        .menuPrefix& {
            display: inline-block;
            font-size: 1.3em;
            width: 100%;
            padding: .333em;
            a& {
                text-decoration: none;
            }
        }
        .p-title-value & {
            .p-title & {
                font-size: 70%;
            }
        }
        &:before {
            position: absolute;
            top: .25em;
            bottom: 0;
            left: .333em;
        }       
        &.@{prefix-name} {
            background: linear-gradient(135deg, @svgPrefixColorGradient 0%, @svgPrefixColorGradient 40%, transparent 40%, transparent 100%), @prefix-color;
            color: rgb(250,250,250);
            text-shadow: 1px 0 1px @svgPrefixTextShadow, 0 1px 1px @svgPrefixTextShadow, -1px 0 1px @svgPrefixTextShadow, 0 -1px 1px @svgPrefixTextShadow;
            &when (iskeyword(@prefix-icon)) {
                padding: .25em .5em .25em 1.75em;
                &:before {
                    .m-faBase();
                    content: "\@{prefix-icon}";
                }
            }
        }       
    }   
}

Then, we make prefixes according to examples

.svgLabelPrefix(important, rgb(198,40,40), f06a);

Where important is the name of the prefix, rgb (198,40,40) is the main color of the prefix, f06a is the icon of the prefix (you can leave it blank)
In the prefix settings, specify your classsvgPrefix important