.firstLetter {
    --fspsHS011-bg-color: brown;

    display: inline-block;
    font-size: 2rem;
    line-height: 1;
    font-weight: 900;
    margin: 0;
    border-bottom: solid 1px var(--fspsHS011-bg-color);
    color: #000000;
}

    .firstLetter::after {
        content: ' ';
        display: inline-block;
        width: 0.5em;
    }

    .firstLetter::first-letter {
        background-color: var(--fspsHS011-bg-color);
        color: #FFFFFF;
        display: inline-block;
        padding: 0.2em;
        margin: 0 0.2em 0 0;
    }