.sortable {
    cursor: pointer;
}

.sortable::before {
    vertical-align: middle;
    content: '\25c0';
    padding-right: 0.2em;
    font-size: 10px;
    font-family: sans-serif;
}

.sortable.desc::before {
    vertical-align: bottom;
    content: '\25bc';
    padding-right: 0.2em;
    font-size: 10px;
}

.sortable.asc::before {
    vertical-align: top;
    content: '\25b2';
    padding-right: 0.2em;
    font-size: 10px;
}