<nav class="skew-menu">
  <ul>
    <li><a href="#">Shoes</a></li>
    <li><a href="#">Sandals</a></li>
    <li><a href="#">Shirts</a></li>
    <li><a href="#">Jackets</a></li>
  </ul>
</nav>
// Play with the values
@radius: 7px;
@skew: 25deg;
@main-color: tomato;

body{
  font-family:Helvetica Neue, Helvetica, sans-serif;
  background:@main-color;
}

.skew-menu{
  text-align:center;
  margin-top:9em;
}

.skew-menu ul{
  display:inline-block;
  margin:0;
  padding:0;
  list-style:none;
  transform:skew(-@skew);
}

.skew-menu ul li{
  background:#fff;
  float:left;
  border-right:1px solid #eee;
  box-shadow:0 1px 1px rgba(0,0,0,0.1);
  text-transform:uppercase;
  color:#555;
  font-weight:bolder;
  transition:all 0.3s linear;
  
  &:first-child{
    border-radius:@radius 0 0 @radius;
  }
  
  &:last-child{
    border-right:none;
    border-radius:0 @radius @radius 0;
  }
  
  &:hover{
    background:#eee;
    color:@main-color;
  }
  
  a{
    display:block;
    padding:1em 2em;
    color:inherit;
    text-decoration:none;
    transform:skew(@skew);
  }
}
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