PureCSS tree menu

http://www.thecssninja.com/css/css-tree-menu

by ademaro

HTML

<ul class="tree">
    <li>
        <label for="folder1">Folder 1</label> 
        <input type="checkbox" checked disabled id="folder1" /> 
        <ol>
            <li class="file"><a href="document.html.pdf">File 1</a></li>
            <li>
                <label for="subfolder1">Subfolder 1</label> <input type="checkbox" id="subfolder1" /> 
                <ol>
                    <li class="file"><a href="">Filey 1</a></li>
                    <li>
                        <label for="subsubfolder1">Subfolder 1</label> <input type="checkbox" id="subsubfolder1" /> 
                        <ol>
                            <li class="file"><a href="">File 1</a></li>
                            <li>
                                <label for="subsubfolder2">Subfolder 1</label> <input type="checkbox" id="subsubfolder2" /> 
                                <ol>
                                    <li class="file"><a href="">Subfile 1</a></li>
                                    <li class="file"><a href="">Subfile 2</a></li>
                                    <li class="file"><a href="">Subfile 3</a></li>
                                    <li class="file"><a href="">Subfile 4</a></li>
                                    <li class="file"><a href="">Subfile 5</a></li>
                                    <li class="file"><a href="">Subfile 6</a></li>
                                </ol>
                            </li>
                        </ol>
                    </li>
                    <li class="file"><a href="">File 3</a></li>
                    <li class="file"><a href="">File 4</a></li>
                    <li class="file"><a href="">File 5</a></li>
                    <li class="file"><a href="">File 6</a></li>
                </ol>
            </li>
        </ol>
    </li>
    <li>
        <label for="folder2">Folder 2</label> <input type="checkbox" id="folder2" /> 
        <ol>
            <li class="file"><a href="">File 1</a></li>
            <li>
 ...

CSS

/* Just some base styles not needed for example to function */
*, html { font-family: Verdana, Arial, Helvetica, sans-serif; }

body, form, ul, li, p, h1, h2, h3, h4, h5
{
    margin: 0;
    padding: 0;
}
body { background-color: #606061; color: #ffffff; margin: 0; }
img { border: none; }
p
{
    font-size: 1em;
    margin: 0 0 1em 0;
}

html { font-size: 100%; /* IE hack */ }
body { font-size: 1em; /* Sets base font size to 16px */ }
table { font-size: 100%; /* IE hack */ }
input, select, textarea, th, td { font-size: 1em; }
/* Just some base styles not needed for example to function */
*, html { font-family: Verdana, Arial, Helvetica, sans-serif; }

body, form, ul, li, p, h1, h2, h3, h4, h5
{
    margin: 0;
    padding: 0;
}
body { background-color: #606061; color: #ffffff; margin: 0; }
img { border: none; }
p
{
    font-size: 1em;
    margin: 0 0 1em 0;
}

html { font-size: 100%; /* IE hack */ }
body { font-size: 1em; /* Sets base font size to 16px */ }
table { font-size: 100%; /* IE hack */ }
input, select, textarea, th, td { font-size: 1em; }
/* Just some base styles not needed for example to function */
*, html { font-family: Verdana, Arial, Helvetica, sans-serif; }

body, form, ul, li, p, h1, h2, h3, h4, h5
{
    margin: 0;
    padding: 0;
}
body { background-color: #606061; color: #ffffff; margin: 0; }
img { border: none; }
p
{
    font-size: 1em;
    margin: 0 0 1em 0;
}

html { font-size: 100%; /* IE hack */ }
body { font-size: 1em; /* Sets base font size to 16px */ }
table { font-size: 100%; /* IE hack */ }
input, select, textarea, th, td { font-size: 1em; }
/* Just some base styles not needed for example to function */
*, html { font-family: Verdana, Arial, Helvetica, sans-serif; }

body, form, ul, li, p, h1, h2, h3, h4, h5
{
    margin: 0;
    padding: 0;
}
body { background-color: #606061; color: #ffffff; margin: 0; }
img { border: none; }
p
{
    font-size: 1em;
    margin: 0 0 1em 0;
}

html { font-size: 100%; /* IE hack */ }
body { font-size:...