.tree {
    min-height: 20px;
    padding: 19px;
    margin-bottom: 20px;
    background-color: #fbfbfb;
    border: 1px solid #999;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05);
    -moz-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05);
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05)
}

    .tree li {
        list-style-type: none;
        margin: 0;
        padding: 10px 0 0 5px;
        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: 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
    }