/* hide groups by default */
.select2-results.select2-treeview .select2-results__options--nested {
    display: none;
}
/* display if open */
.select2-results.select2-treeview .select2-results__options--nested.open {
    display: block;
}

/* Arrows */
.select2-results.select2-treeview .select2-results__group:before {
    content: "\f139";
    font-family: dashicons;
    padding-right: 0.2em;
    font-size: 1.7em;
    line-height: 0.9em;
    vertical-align: middle;
}
.select2-results.select2-treeview .select2-results__group.open:before {
    content: "\f140";
}
.select2-treeview-add-all, .select2-treeview-remove-all {
    display: none;
}
li:hover .select2-treeview-add-all,
li:hover .select2-treeview-remove-all {
    display: block;
    float: right;
}
.select2-treeview-add-all:hover, .select2-treeview-remove-all:hover {
    color: #026AA7;
}