.prezent-grid-sortable {
    position: relative;
}

.prezent-grid-sortable::after {
    content: "";
    display: block;
    width: 0;
    height: 0;
    border: 5px solid rgba(255, 255, 255, 0);
    position: absolute;
    top: 0;
    right: -15px;
    -moz-transform: scale(.9999);
}

.prezent-grid-sortable[data-sort-dir="desc"]::after {
    top: 6px;
    border-top-color: #000;
}

.prezent-grid-sortable[data-sort-dir="asc"]::after {
    border-bottom-color: #000;
}