, :
HTML
<div id="l-primary-nav">
<ul class="l-inline">
<li><a href="#">Home</a>
</li>
<li class="active"><a href="#">About</a>
</li>
<li><a href="#">Articles</a>
</li>
<li><a href="#">Calendar</a>
</li>
</ul>
< > CSS
l-primary-nav {
width: 600px;
margin: 0 auto;
}
.l-inline li {
display: inline-block;
}
l-primary-nav ul {
width: 99.8%;
margin: 0;
padding: 0;
border: 1px solid #c2c2c2;
float: left;
display: table;
}
l-primary-nav li {
text-align: center;
display: table-cell;
float: left;
}
l-primary-nav li a{
line-height: 40px;
height: 41px;
padding: 0 30px;
border-top: 1px transparent;
display: block;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0.18, #FBFBFB), color-stop(1, #D1D1D1));
background-image: -o-linear-gradient(bottom, #FBFBFB 0%, #D1D1D1 100%);
background-image: -moz-linear-gradient(bottom, #FBFBFB 0%, #D1D1D1 100%);
background-image: -webkit-linear-gradient(bottom, #FBFBFB 0%, #D1D1D1 100%);
background-image: -ms-linear-gradient(bottom, #FBFBFB 0%, #D1D1D1 100%);
background-image: linear-gradient(to bottom, #FBFBFB 0%, #D1D1D1 100%);
}
l-primary-nav li a:hover {
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #E1E3E6), color-stop(1, #BABCBF));
background-image: -o-linear-gradient(bottom, #E1E3E6 0%, #BABCBF 100%);
background-image: -moz-linear-gradient(bottom, #E1E3E6 0%, #BABCBF 100%);
background-image: -webkit-linear-gradient(bottom, #E1E3E6 0%, #BABCBF 100%);
background-image: -ms-linear-gradient(bottom, #E1E3E6 0%, #BABCBF 100%);
background-image: linear-gradient(to bottom, #E1E3E6 0%, #BABCBF 100%);
}
l-primary-nav li.active a{
margin-top: -5px;
height: 45px;
position: relative;
background: #fff;
border-left: 1px solid #c2c2c2;
border-right: 1px solid #c2c2c2;
border-top: 1px solid #c2c2c2;
}