.tree {
    /*min-height:20px;*/
    padding:0 0 40px 0;
    margin-bottom:20px;
    background-color:#fbfbfb;
    border:1px solid #999;
    -webkit-border-radius:15px;
    -moz-border-radius:15px;
    border-radius:15px;
    -webkit-box-shadow:inset 0 0 20px rgba(3, 3, 3, .3);
    -moz-box-shadow:inset 0 0 20px rgba(3, 3, 3, .3);
    box-shadow:inset 0 0 20px rgba(3, 3, 3, .3);
    height: 120vh;
    overflow-y: auto;
}
.tree>ul{
    padding-left: 10px;
    margin: 0;
}
.tree ul li>ul{
    padding-left: 34px;
}
.tree ul li>ul li a{
    color: #333;
}
.tree ul li>ul li a:hover{
    color: #00aeae;
}
.tree li {
    list-style-type:none;
    margin:0;
    padding:15px 2px 0 0px;
    position:relative
}
.tree li::before, .tree li::after {
    content:'';
    left:-20px;
    position:absolute;
    right:auto
}
.tree li::before {
    border-left:1px solid #999;
    bottom:50px;
    height:100%;
    top:0;
    width:1px
}
.tree li::after {
    border-top:1px solid #999;
    height:20px;
    top:30px;
    width:20px
}
.tree li span {
    -moz-border-radius:5px;
    -webkit-border-radius:5px;
    border:1px solid #999;
    border-radius:5px;
    display:inline-block;
    padding:3px 8px;
    text-decoration:none
}
.tree li.parent_li>span {
    cursor:pointer
}
.tree>ul>li::before, .tree>ul>li::after {
    border:0
}
.tree li:last-child::before {
    height:30px
}
.tree li.parent_li>span:hover, .tree li.parent_li>span:hover+ul li span {
    background:#eee;
    border:1px solid #94a0b4;
    color:#000
}