.cq_vc_expandgrid_item {
    background-image: url(../img/icon_expandgrid_item.png) !important;
    background-size: 32px;
}
.cq_vc_expandgrid {
    background-image: url(../img/icon_expandgrid.png) !important;
    background-size: 32px;
    background-position: 0 0 !important
}