.tabledrag-cell .draggables-collapser {
    height: 30px;
    z-index: 9;
    top: 15px;
    margin-right: 5px;
}

.draggables-collapser.state-expanded:after {
    transform: translateY(50%) rotate(180deg);
}

.draggables-collapser.state-collapsed:after {
    transform: translateY(50%) rotate(0);
}