CSS3 vertical treemap--using :before and :after_html/css_WEB-ITnose

Go directly to the picture (original website) and practice the demo of CSS3 by yourself.

【demo】

【HTML】

<div class="tree">        <ul>            <li>                <a href="#">parent</a>                <ul>                    <li>                        <a href="#">child</a>                        <ul>                            <li>                                <a href="#">Grant child</a>                            </li>                        </ul>                    </li>                    <li>                        <a href="#">child</a>                        <ul>                            <li><a href="#">Grant child</a></li>                            <li>                                <a href="#">Grant child</a>                                <ul>                                    <li><a href="#">Great Grant child</a></li>                                    <li><a href="#">Great Grant child</a></li>                                    <li><a href="#">Great Grant child</a></li>                                </ul>                            </li>                            <li><a href="#">Grant child</a></li>                        </ul>                    </li>                </ul>            </li>        </ul>        </div>

【CSS3】

*{
 margin:0;
 padding:0;
}
.tree ul{
 padding-top:20px;
 position: relative;
webkit-transition: all 0.5s;
-moz-transition: all 0.5s;
transition:all .3s;
}
.tree li{
float:left;
list-style: none;
text-align: center;
position: relative;
padding:20px 5px 0 5px;
webkit-transition: all 0.5s;
- moz-transition: all 0.5s;
transition:all .3s;
}
/*Use::before,::after to make branch lines*/
.tree li::before,. tree li::after{
content: "";
position: absolute;
top:0;
right:50%;
width:50%;
height:20px ;
 border-top:1px solid #ccc;
}
.tree li:after{
 right:auto;
 left:50%;
 border-left:1px solid #ccc;
}
.tree li:first-child::before,.tree li:last-child::after{
　　border:0 none;
}
.tree li :last-child::before{
 border-right:1px solid #ccc;
 -webkit-border-radius: 0 10px 0 0;
 -moz-border-radius: 0 10px 0 0;
 border-radius: 0 10px 0 0;
}
.tree li:first-child::after{
 -webkit-border-radius: 10px 0 0 0;
 -moz -border-radius: 10px 0 0 0;
　　border-radius: 10px 0 0 0;
}

/*Delete branch lines with only one branch*/
.tree li:only-child::before,.tree li:only-child::after{
　border:none;
}
.tree li:only-child{
　padding-top :0;
}

/*Add a lower branch line with only one branch*/
.tree ul ul::before{
content:"";
Position: absolute;
top:0;
left:50%;
border-left:1px solid #ccc;
width:0;
height:20px;
}
.tree a{
 display: inline-block;
 border:1px solid #ccc;
 padding: 5px 10px;
 color: #666;
 text-decoration: none ;
padding:10px;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
s;
-moz-transition: all 0.5s;
transition:all .3s;
}

.tree li a:hover, .tree li a:hover ul li a{
background-color: #c8e4f8;
color: #000;
border: 1px solid #94a0b4;
}
.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;
}