.sidebar-menu .treeview > a i.fa-angle-left {
    -webkit-transition: transform 0.3s ease-out;
    -moz-transition: transform 0.3s ease-out;
    -ms-transition: transform 0.3s ease-out;
    -o-transition: transform 0.3s ease-out;
    transition: transform 0.3s ease-out;
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
}

.sidebar-menu .treeview.active > a i.fa-angle-left {
    -webkit-transform: rotate(-90deg);
    -moz-transform: rotate(-90deg);
    -ms-transform: rotate(-90deg);
    -o-transform: rotate(-90deg);
    transform: rotate(-90deg);
}
