div.panel:first-child {
    margin-top:20px;
}

div.treeview {
    min-width: 100px;
    min-height: 100px;
    
    max-height: 256px;
    overflow:auto;
    
    padding: 4px;
    
    margin-bottom: 20px;
    
    color: #369;
    
    border: solid 1px;
    border-radius: 4px;
}
div.treeview ul:first-child:before {
    display: none;
}
.treeview, .treeview ul {
    margin:0;
    padding:0;
    list-style:none;
    
    color: #369;
}
.treeview ul {
    margin-left:1em;
    position:relative
}
.treeview ul ul {
    margin-left:.5em
}
.treeview ul:before {
    content:"";
    display:block;
    width:0;
    position:absolute;
    top:0;
    left:0;
    border-left:1px solid;
    bottom:15px;
}
.treeview li {
    margin:0;
    padding:0 1em;
    line-height:2em;
    font-weight:700;
    position:relative
}
.treeview ul li:before {
    content:"";
    display:block;
    width:10px;
    height:0;
    border-top:1px solid;
    margin-top:1px;
    position:absolute;
    top:1em;
    left:0
}
.tree-indicator {
    margin-right:5px;
    
    cursor:pointer;
}
.treeview li a {
    text-decoration: none;
    color:inherit;
    
    cursor:pointer;
}
.treeview li button, .treeview li button:active, .treeview li button:focus {
    text-decoration: none;
    color:inherit;
    border:none;
    background:transparent;
    margin:0px 0px 0px 0px;
    padding:0px 0px 0px 0px;
    outline: 0;
}