.tree{    
    float: left;
    display: flex;
    text-align: center;
    border-bottom: 1px solid #333;
    height: 12px;
    width: 36px;
    margin-top: -3px;
    margin-right: 5px;
    margin-left: -15px;}
    
.tk{background: #fff;
    padding: 0 8px;    color: transparent;
 }
 li{list-style-type:none;} 
ul#sheng, ul#sheng ul {
    margin: 0;
    padding: 0 0 0 0.5em;
}
 
ul#sheng li {
    list-style: none;
    position: relative;
    padding-left: 1.1em;
}
 
ul#sheng li:before {
    position: absolute;
    content: '';
    left: -0.5em;
    width: 1.5em;
    height: 0.615em;
    border-style: none none solid solid;
    border-width: 0.05em;
}
 
 .treep{

    position: absolute;
    content: '';
    top: -0.1em;
    left: -0.5em;
    width: 1.5em;
    height: 0.615em;
    border-style: none none solid solid;
    border-width: 0.05em;
}

ul#sheng li:not(:last-child):after {
    position: absolute;
    content: '';
    top: 0;
    left: -0.5em;
    bottom: 0;
    border-style: none none none solid;
    border-width: 0.05em;
}