ul, #treeUL {
    list-style-type: none;    
}

ul.tree-nested, #treeUL li {
    padding-left: 15px;
}

.noselect {
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Safari */
    -khtml-user-select: none; /* Konqueror HTML */
    -moz-user-select: none; /* Old versions of Firefox */
    -ms-user-select: none; /* Internet Explorer/Edge */
    user-select: none; /* Non-prefixed version, currently
                                  supported by Chrome, Edge, Opera and Firefox */
}

.tree-caret {
    cursor: pointer;
    -webkit-user-select: none; /* Safari 3.1+ */
    -moz-user-select: none; /* Firefox 2+ */
    -ms-user-select: none; /* IE 10+ */
    user-select: none;    
}

.tree-caret::before {
    content: "\25B6";
    color: black;
    display: inline-block;
    margin-right: 6px;
    font-size:10px;
}

.tree-caret-down::before {
    -ms-transform: rotate(90deg); /* IE 9 */
    -webkit-transform: rotate(90deg); /* Safari */
    ' transform: rotate(90deg);
}

.tree-nested {
    display: none;
}

.tree-active {
    display: block;
}

.tree-selected {
    background-color: gainsboro;
}

.tree-pointer {
    cursor: pointer;
    font-size: 12px;
}

.tree-node-selected {
    background-color: gainsboro;
}