div.switch-outer {
    background:    var(--col-switch-bg);
    border-radius: 20px;
    border:        1px solid var(--col-switch-fg);
    cursor:        pointer;
    height:        20px;
    transition:    background 0.1s linear;
    width:         40px;
}

div.switch-inner {
    background:    var(--col-switch-fg);
    border-radius: 20px;
    height:        20px;
    transition:    margin-left 0.1s linear;
    width:         20px;
}

input:checked + div.switch-outer {
    background: var(--col-switch-bg-hl);
}

input:checked + div.switch-outer > div.switch-inner {
    margin-left: 20px;
}