Вертикальная навигация с эффектом в CSS

<link rel="stylesheet" href="https://netdna.bootstrapcdn.com/font-awesome/3.1.1/css/font-awesome.min.css">

<nav>
  <UL>
  <li class="var_nav">
  <div class="link_bg"></div>
  <div class="link_title">
  <div class=icon>  
  <i class="icon-mobile-phone icon-2x"></i>
  </div>
  <a href="#"><span>About Us</span></a>
  </div>
  </li>
  <li class="var_nav">
  <div class="link_bg"></div>
  <div class="link_title">
  <div class=icon>  
  <i class="icon-lightbulb icon-2x"></i>
  </div>
  <a href="#"><span>Ideas</span></a>
  </div>
  </li>
  <li class="var_nav">
  <div class="link_bg"></div>
  <div class="link_title">
  <div class=icon>  
  <i class="icon-wrench icon-2x"></i>
  </div>
  <a href="#"><span>Services</span></a>
  </div>
  </li>
  <li class="var_nav">
  <div class="link_bg"></div>
  <div class="link_title">
  <div class=icon>  
  <i class="icon-briefcase icon-2x"></i>
  </div>
  <a href="#"><span>Marketing</span></a>
  </div>
  </li>
  </UL>
</nav>

ul
{
margin:0px;
padding:0px;
list-style-type:none;
-webkit-backface-visibility: hidden; backface-visibility: hidden;  
}
.var_nav
{
position:relative;
background:#ccc;  
width:300px;
height:70px;
margin-bottom:5px;
}
.link_bg
{
  width:70px;
  height:70px;
  position:absolute;
  background:#E01B6A;
  color:#fff;
  z-index:2;
}
.link_bg i
{
  position:relative;
}
.link_title
{
position:absolute;
width:100%;
z-index:3;
color:#fff;
}
.link_title:hover .icon
{
-webkit-transform:rotate(360deg);
-moz-transform:rotate(360deg);
-o-transform:rotate(360deg);
-ms-transform:rotate(360deg);
transform:rotate(360deg);  
}
.var_nav:hover .link_bg
{
width:100%;
background:#E01B6A;
-webkit-transition: all 0.3s ease-in-out;
-moz-transition: all 0.3s ease-in-out;
-o-transition: all 0.3s ease-in-out;
-ms-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;  
}
.var_nav:hover a
{
font-weight:bold;
-webkit-transition:all .5s ease-in-out;
-moz-transition:all .5s ease-in-out;  
-o-transition:all .5s ease-in-out;  
-ms-transition:all .5s ease-in-out;
  transition:all .5s ease-in-out;  
}
.icon
{
position:relative;
width:70px;
height:70px;
text-align:center;
color:#fff;
-webkit-transition:all .5s ease-in-out;
-moz-transition:all .5s ease-in-out;  
-o-transition:all .5s ease-in-out;  
-ms-transition:all .5s ease-in-out;  
float:left;
transition:all .5s ease-in-out;  
float:left;  
}
.icon i{top:22px;position:relative;}
a{
display:block;
position:absolute;
float:left;
font-family:arial;
color:#fff;
text-decoration:none;
width:100%;
height:70px;
text-align:center;
}
span
{
margin-top:25px;
display:block;
}