mana/sass/_duo.scss

.#{$ms-prefix}-duo {

    // base border styles
    &::after {
        color: #000;
        content: '';
        display: block;
        font-size: 1em;
        height: 100%;
        left: 0;
        position: absolute;
        top: 0;
        width: 100%;
    }

    // set default inner to black unless we're adding color to the background
    color: #fff;

    // multicolor symbol
    &.#{$ms-prefix}-multicolor::after {
        content: "\e986";
    }

    // strixhaven schools
    &.#{$ms-prefix}-school {
        &-lorehold::after {
            content: "\e99b";
        }
        &-prismari::after {
            content: "\e99d";
        }
        &-quandrix::after {
            content: "\e99f";
        }
        &-silverquill::after {
            content: "\e9a1";
        }
        &-witherbloom {
            &::before {
                content: "\e9a3";
            }
            &::after {
                content: "\e9a4";
            }
        }
    }

    // colorized versions
    &-color {
        // default outer color
        &::before {
            color: $ms-border-black;
        }
        // multicolor
        &.#{$ms-prefix}-multicolor {
            &::after {
                color: $ms-multicolor-flat;
            }
            &.#{$ms-prefix}-grad::after {
                background: $ms-multicolor-grad;
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
            }
        }
        // strixhaven schools
        &.#{$ms-prefix}-school {
            &-lorehold {
                &::before { color: #a03731; }
                &::after { color: #e4e8c7; }
            }
            &-prismari {
                &::before { color: #a23431; }
                &::after { color: #322f5c; }
            }
            &-quandrix {
                &::before { color: #352e5f; }
                &::after { color: #519e52; }
            }
            &-silverquill {
                &::before { color: #181616; }
                &::after { color: #e5e9ca; }
            }
            &-witherbloom {
                &::before { color: #2f312d; }
                &::after { color: #4f9b4f; }
            }
        }
    }

}