.categories_bs{
    position: relative;
}
.left-column .categories_bs .list-group-item{
    border-bottom: 0;
    border-left: 0;
    border-right: 0;
}
.categories_bs ul{
    list-style: none;
    margin: 0;
    padding: 0;
}
.categories_bs a:link{
    text-decoration: none;
}
.categories_bs ul li.folder ul{
    display: none;
}
.categories_bs ul li.folder{
    position: relative;
}
.categories_bs>ul>li.foldercurrent{
    position: static;
}
.categories_bs ul li.foldercurrent .list-group-item{
    border: 0;
}
/* 1 lvl */
.categories_bs > ul > li > a{
    font-weight: bold;
}
/* 2 lvl */
.categories_bs > ul > li > ul{
    padding: 0.75rem 1.25rem;
    column-width: 270px;
}
.categories_bs > ul > li > ul > li > a{
    font-weight: bold;
}
/* 3 lvl */
.categories_bs > ul > li > ul > li > ul{
    padding: 0.1rem 0.4rem;
}
/* hover */
@media(min-width: 768px){
    .categories_bs > ul > li.folder:hover ul{
        display: block;
    }
    .categories_bs > ul > li.folder:hover > ul{
        position: absolute;
        left: 90%;
        top: -50%;
        z-index: 3;
        box-shadow: 0 1px 2px 0 rgba(0,0,0,0.16);
        background-color: #fff;
        width: 600px;
        border: 1px solid rgba(0,0,0,0.16);
    }
}
/* arrow */
.show_cats{
    transition: transform .4s;
}
li.foldercurrent .show_cats{
    transform: rotate(180deg);
}
/* panel */
#target-sidepanel .categories_bs{
    box-shadow: none;
}
#target-sidepanel .categories_bs>ul>li.foldercurrent{
    border: 1px solid #009AD3;
}
#target-sidepanel li.foldercurrent + li.foldercurrent{
    border-top: 0;
}