family tree 1.0

http://thecodeplayer.com/walkthrough/css3-family-tree

by velo_ninja

HTML

<div class="tree">
    <ul>
        <li>
            <a href="#" onclick="toggleBox('parent')">Parent</a>
            <div id="parent" class="box" style="display: none; background-color: lightblue;"> 
                Parent Box
                <img src="parent_image.jpg" alt="Parent Image">
            </div>

            <ul>
                <li>
                    <a href="#" onclick="toggleBox('child1')">Child</a>
                    <div id="child1" class="box" style="display: none; background-color: lightgreen;">
                        Child Box 1
                        <img src="child1_image.jpg" alt="Child 1 Image">
                    </div>

                    <ul>
                        <li>
                            <a href="#" onclick="toggleBox('grandchild1')">Grand Child</a>
                            <div id="grandchild1" class="box" style="display: none; background-color: lightcoral;">
                                Grand Child Box 1
                                <img src="grandchild1_image.jpg" alt="Grand Child 1 Image">
                            </div>
                        </li>
                    </ul>
                </li>
                <li>
                    <a href="#" onclick="toggleBox('child2')">Child</a>
                    <div id="child2" class="box" style="display: none; background-color: lightsalmon;">
                        Child Box 2
                        <img src="child2_image.jpg" alt="Child 2 Image">
                    </div>

                    <ul>
                        <li>
                            <a href="#" onclick="toggleBox('grandchild2')">Grand Child</a>
                            <div id="grandchild2" class="box" style="display: none; background-color: lightyellow;">
                                Grand Child Box 2
                                <img src="grandchild2_image.jpg" alt="Grand Child 2 Image">
                            </div>
                        </li>
                ...

CSS

/* Original CSS */
.tree {
    margin: 0;
    padding: 0;
}




.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;
}
.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;
}
.tree li:only-child::after, .tree li:only-child::before {
    display: none;
}
.tree li:only-child {
    padding-top: 0;
}
.tree li:first-child::before, .tree li:last-child::after {
    border: 0 none;
}
.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;
}
.tree ul ul::before {
    content:'';
    position: absolute;
    top: 0;
    left: 50%;
    border-left: 1px solid #ccc;
    width: 0;
    height: 20px;
}
.tree li a {
    border: 1px solid #ccc;
    padding: 5px 10px;
    text-decoration: none;
    color: #666;
    font-family: arial, verdana, tahoma;
    font-size: 11px;
    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;
}
.tree li a:hover, .tree li a:hover+ul li a {
    background: #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 {
   ...