.shop-list-catalog li ul.child_el{display:none}
.parent_li{position:relative}
.parent_li span{position: absolute;
    top: -4px;
    right: 0;
    font-size: 25px;
    transition: .3s ease-in-out;
    content: "+";
cursor: pointer}
.parent_li.active span{transform: rotate(-45deg);}