.tree {
    min-height:20px;
    padding:20px;
    margin-bottom:20px;
}
.tree li {
    list-style-type:none;
    margin:0;
    padding:10px 5px 0 15px;
    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:25px;
    width:25px
}
.tree li span {
    -moz-border-radius:5px;
    -webkit-border-radius:5px;
    border:1px solid #999;
    border-radius:5px;
    display:inline-block;
    padding:7px 10px;
    text-decoration:none
}
.tree li.parent_li>span {
    cursor:pointer;
    font-size: 15px;
    font-weight: bold;
}
.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:#d6def0;
    border:1px solid #94a0b4;
    color:#000
}
.tree li.parent_li {
	margin-bottom:30px;
}

.tree > ul > li > ul > li {
    display: none;
}