/*Now the CSS*/
    * {
        margin: 0;
        padding: 0;
    }
    .tree {
        width: auto;
        margin-left: auto;
        margin-right: auto;
    }
    .tree ul {
        padding-top: 20px;
        position: relative;
        transition: all 0.5s;
        -webkit-transition: all 0.5s;
        -moz-transition: all 0.5s;
    }
    .tree li {
      float: left;
        text-align: center;
        list-style-type: none;
        position: relative;
        padding: 20px 5px 0 5px;
        transition: all 0.5s;
        -webkit-transition: all 0.5s;
        -moz-transition: all 0.5s;
    }
    /*We will use ::before and ::after to draw the connectors*/
    .tree li::before, .tree li::after {
        content:'';
        position: absolute;
        top: 0;
        right: 50%;
        border-top: 1px solid #ccc;
        width: 50%;
        height: 20px;
    }
    .tree li:after {
        right: auto;
        left: 50%;
        border-left: 1px solid #ccc;
    }
    /*We need to remove left-right connectors from elements without 
any siblings*/
    .tree li:only-child::after, .tree li:only-child::before {
        display: none;
    }
    /*Remove space from the top of single children*/
    .tree li:only-child {
        padding-top: 0;
    }
    /*Remove left connector from first child and 
right connector from last child*/
    .tree li:first-child::before, .tree li:last-child::after {
        border: 0 none;
    }
    /*Adding back the vertical connector to the last nodes*/
    .tree li:last-child::before {
        border-right: 1px solid #ccc;
        border-radius: 0 5px 0 0;
        -webkit-border-radius: 0 5px 0 0;
        -moz-border-radius: 0 5px 0 0;
    }
    .tree li:first-child::after {
        border-radius: 5px 0 0 0;
        -webkit-border-radius: 5px 0 0 0;
        -moz-border-radius: 5px 0 0 0;
    }
    /*Time to add downward connectors from parents*/
    .tree ul ul::before {
        content:'';
        position: absolute;
        top: 0;
        left: 50%;
        border-left: 1px solid #ccc;
        width: 0;
        height: 20px;
        margin-left: -1px;
    }
    .tree li a {
        background: #c8e4f8; /* 背景顏色 */
        border: 1px solid #ccc;
        padding: 5px 10px;
        text-decoration: none;
        color: #666;
        font-family: arial, verdana, tahoma;
        font-size: 14px; /* 字型大小 */
        display: inline-block;
        border-radius: 5px;
        -webkit-border-radius: 5px;
        -moz-border-radius: 5px;
        transition: all 0.5s;
        -webkit-transition: all 0.5s;
        -moz-transition: all 0.5s;
    }
    /*Time for some hover effects*/
    /*We will apply the hover effect the the lineage of the element also*/
    .tree li a:hover, .tree li a:hover+ul li a {
      background: #FFFFCC; /* hover背景顏色 */
        color: #000;
        border: 1px solid #94a0b4;
    }
    /*Connector styles on hover*/
    .tree li a:hover+ul li::after, .tree li a:hover+ul li::before, .tree li a:hover+ul::before, .tree li a:hover+ul ul::before {
        border-color: #94a0b4;
    }
    li a.just-line {
        display: none;
    }
    a.just-line + ul {
        padding-top: 74px;
    }
    a.just-line + ul:before {
        height: 74px;
    }