.desc{
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 2px;
    vertical-align: middle;
    border-top: 4px dashed;
    border-right: 4px solid transparent;
    border-left: 4px solid transparent;
}

.asc{
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 2px;
    vertical-align: middle;
    border-right: 4px solid transparent;
    border-left: 4px solid transparent;
    border-top: 0;
    border-bottom: 4px dashed;
}

a.sort{
    color: #212529;
    display: block;
}