TmMolStar/src/mol-plugin-ui/skin/base/components/sequence.scss

.msp-sequence {
    position: absolute;
    right: 0;
    top: 0;
    left: 0;
    bottom: 0;
    background: $sequence-background;
}

$sequence-select-height: 24px;
.msp-sequence-select {
    position: relative;
    height: $sequence-select-height;
    width: 100%;
    margin-bottom: 1px;
    background: $control-background;
    text-align: left;

    > span {
        display: inline-block;
        line-height: $sequence-select-height;
        padding: 0 $control-spacing;
        font-size: 85%;
        font-weight: bold;
        cursor: default;
    }

    > select {
        display: inline-block;
        max-width: 120px;
        width: auto;
        text-overflow: ellipsis;
        font-size: 85%;
        height: $sequence-select-height;
        line-height: $sequence-select-height;
        background-size: 6px 8px;
        background-color: $control-background;
    }
}

.msp-sequence-wrapper {
    word-break: break-word;
    // use $control-spacing for top to have space for sequence numebrs
    padding: $control-spacing $control-spacing $info-vertical-padding $control-spacing;
    user-select: none;
}

.msp-sequence-wrapper-non-empty {
    font-size: 85%;
    line-height: 180%;
    font-family: "Courier New", monospace;
    background: $msp-form-control-background;

    width: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    position: absolute;
    top: $sequence-select-height + 1px;
    left: 0;
    bottom: 0;
    right: 0;
}

.msp-sequence-chain-label {
    margin-left: $control-spacing;
    margin-top: $control-spacing;
    user-select: none;
    color: $sequence-number-color;
    font-size: 90%;
    line-height: 90%;
    padding-left: 0.2em;
}

.msp-sequence-wrapper {
    span {
        cursor: pointer;
    }

    .msp-sequence-residue-long {
        margin: 0em 0.2em 0em 0.2em;
    }

    .msp-sequence-residue-long-begin {
        margin: 0em 0.2em 0em 0em;
    }

    .msp-sequence-label {
        color: $sequence-number-color;
        font-size: 90%;
        line-height: 90%;
        padding-bottom: 1em;
        padding-left: 0.2em;
    }
    
    .msp-sequence-number {
        color: $sequence-number-color;
        word-break: keep-all;
        cursor: default;
        position: relative;
        top: -1.1em;
        left: 3.1em;
        padding: 0px;
        margin-left: -3em;
        font-size: 80%;
    }

    .msp-sequence-number-long {
        left: 3.3em;
    }

    .msp-sequence-number-long-negative {
        left: 2.7em;
    }

    .msp-sequence-number-negative {
        left: 2.5em;
    }

    .msp-sequence-present {
        color: $font-color;
    }

    .msp-sequence-missing {
        color: color-lower-contrast($font-color, 33%);
    }
}