28. Menú vertical 4 niveles

<ul class="nav__list">
<li><a href="#">Bienvenido</a></li>
<li><input id="group-1" type="checkbox" /> <label for="group-1"><span class="fa fa-angle-right">&nbsp;</span> Bienvenido</label>
<ul class="group-list">
<li><a href="#">1st level item</a></li>
<li><input id="sub-group-1" type="checkbox" /> <label for="sub-group-1"><span class="fa fa-angle-right">&nbsp;</span> Second level</label>
<ul class="sub-group-list">
<li><a href="#">2nd level nav item</a></li>
<li><a href="#">2nd level nav item</a></li>
<li><a href="#">2nd level nav item</a></li>
<li><input id="sub-sub-group-1" type="checkbox" /> <label for="sub-sub-group-1"><span class="fa fa-angle-right">&nbsp;</span> Third level</label>
<ul class="sub-sub-group-list">
<li><a href="#">3rd level nav item</a></li>
<li><a href="#">3rd level nav item</a></li>
<li><a href="#">3rd level nav item</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><input id="group-2" type="checkbox" /> <label for="group-2"><span class="fa fa-angle-right">&nbsp;</span> Amor</label>
<ul class="group-list">
<li><a href="#">Flash</a></li>
<li><a href="#">1st level item</a></li>
<li><input id="sub-group-2" type="checkbox" /> <label for="sub-group-2"><span class="fa fa-angle-right">&nbsp;</span> Second level</label>
<ul class="sub-group-list">
<li><a href="#">2nd level nav item</a></li>
<li><a href="#">2nd level nav item</a></li>
<li><input id="sub-sub-group-2" type="checkbox" /> <label for="sub-sub-group-2"><span class="fa fa-angle-right">&nbsp;</span> Third level</label>
<ul class="sub-sub-group-list">
<li><a href="#">3rd level nav item</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><input id="group-3" type="checkbox" /> <label for="group-3"><span class="fa fa-angle-right">&nbsp;</span> First level</label>
<ul class="group-list">
<li><a href="#">1st level item</a></li>
<li><a href="#">1st level item</a></li>
<li><input id="sub-group-3" type="checkbox" /> <label for="sub-group-3"><span class="fa fa-angle-right">&nbsp;</span> Second level</label>
<ul class="sub-group-list">
<li><a href="#">2nd level nav item</a></li>
<li><a href="#">2nd level nav item</a></li>
<li><a href="#">2nd level nav item</a></li>
<li><input id="sub-sub-group-3" type="checkbox" /> <label for="sub-sub-group-3"><span class="fa fa-angle-right">&nbsp;</span> Third level</label>
<ul class="sub-sub-group-list">
<li><a href="#">3rd level nav item</a></li>
<li><a href="#">3rd level nav item</a></li>
<li><a href="#">3rd level nav item</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><input id="group-4" type="checkbox" /> <label for="group-4"><span class="fa fa-angle-right">&nbsp;</span> First level</label>
<ul class="group-list">
<li><a href="#">1st level item</a></li>
<li><input id="sub-group-4" type="checkbox" /> <label for="sub-group-4"><span class="fa fa-angle-right">&nbsp;</span> Second level</label>
<ul class="sub-group-list">
<li><a href="#">2nd level nav item</a></li>
<li><a href="#">2nd level nav item</a></li>
</ul>
</li>
</ul>
</li>
</ul>

CSS

<style><!--
.nav a, .nav label {
 display: block;
  padding: .85rem;
  color: #000;
  background-color: #fff;
  box-shadow: inset 0 -1px #1d1d1d;
  -webkit-transition: all .25s ease-in;
  transition: all .25s ease-in;
}
 
}
.nav a:focus, .nav a:hover, .nav label:focus, .nav label:hover {
  color: rgba(196, 202, 229, 0.5);
 

}
.nav label { cursor: pointer; }
/**
 * Styling first level lists items
 */
.group-list a, .group-list label {
 padding: 2px 7px 2px 2px;
 font-size: 17px;
 font-family: Old English Text MT;
 text-shadow: #606060 -2px -2px 4px;#939593 1px 1px 2px;#565856 1px 2px 3px;
background: #C6E4E6;
 border-radius: 5px;
width:120px;
height: 63px;
border: 1px dotted #ccc; 
box-shadow: inset 0 -1px #373737;
}
.group-list a:focus, .group-list a:hover, .group-list label:focus, .group-list label:hover { background: #E6C6DC; }
/**
 * Styling second level list items
 */
.sub-group-list a, .sub-group-list label {
  padding-left: 1rem;
 font-size: 17px;
 font-family: Old English Text MT;
 text-shadow: #606060 -2px -2px 4px;#939593 1px 1px 2px;#565856 1px 2px 3px;
  background:linear-gradient(45deg, #D8C6E6 30%,#ffffff 50%,#C6E4E6 70%);
border-radius: 5px;
 width:120px;
height: 63px;
box-shadow: inset 0 -1px #474747;
}

.sub-group-list a:focus, .sub-group-list a:hover, .sub-group-list label:focus, .sub-group-list label:hover { background: #C6CCE6; }

/**
 * Styling third level list items
 */
.sub-sub-group-list a, .sub-sub-group-list label {
padding-left: 1rem;
  background: #E6E0C6;
  box-shadow: inset 0 -1px #575757;
}
.sub-sub-group-list a:focus, .sub-sub-group-list a:hover, .sub-sub-group-list label:focus, .sub-sub-group-list label:hover { background: #D4E6C6; }
/**
 * Hide nested lists
 */
.group-list, .sub-group-list, .sub-sub-group-list {
  height: 100%;
  max-height: 0;
  overflow: hidden;
  -webkit-transition: max-height .5s ease-in-out;
  transition: max-height .5s ease-in-out;
}
.nav__list input[type=checkbox]:checked + label + ul { /* reset the height when checkbox is checked */
max-height: 1000px; }
label > span {
  float: right;

  -webkit-transition: -webkit-transform .65s ease;
  transition: transform .65s ease;
}
.nav__list input[type=checkbox]:checked + label > span {

  -webkit-transform: rotate(90deg);
  -ms-transform: rotate(90deg);
  transform: rotate(90deg);
}
--></style>