<h1>Animated Product Menu</h1>
<ul>
  <li><a href="#" class="item">Size <i class="fa fa-chevron-down"></i></a>
    <span class="accent"></span>
    <ul class="drop-down">
      <li><a href="#">Small</a></li>
      <li><a href="#">Medium</a></li>
      <li><a href="#">Large</a></li>
      <li><a href="#">Extra Large</a></li>
    </ul>
  </li>
  <li><a href="#" class="item">Color <i class="fa fa-chevron-down"></i></a>
    <span class="accent"></span>
    <ul class="drop-down">
      <li><a href="#">Blue</a></li>
      <li><a href="#">Black</a></li>
      <li><a href="#">Orange</a></li>
      <li><a href="#">Green</a></li>
      <li><a href="#">Red</a></li>
      <li><a href="#">Yellow</a></li>
    </ul>
  </li>
  <li><a href="#" class="item">Brand <i class="fa fa-chevron-down"></i></a>
    <span class="accent"></span>
    <ul class="drop-down">
      <li><a href="#">Nike</a></li>
      <li><a href="#">Addidas</a></li>
      <li><a href="#">Newbalance</a></li>
      <li><a href="#">Vans</a></li>
    </ul>
  </li>
</ul>
h1 {
  margin: 50px 0;
  font-size: 50px;
  font-weight: 100;
  text-align: center;
  font-family: "Open Sans";
}

ul {
width: 620px;
margin: 0 auto;
  
  li {
    float: left;
    list-style: none;
    margin-right: 10px;
    position: relative;
    
    a {
      font: 700 15px Open Sans;
      text-transform: uppercase;
      position: relative;
      color: #333333;
      text-decoration: none;
      border: 3px solid #000000;
      letter-spacing: 1px;
      padding: 10px 15px 10px 25px;
      display: block;
      width: 150px;
      z-index: 5000;
      
      i {
        font-size: 12px !important;
        position: absolute;
        right: 10px;
        top: 14px;
      }
    }
    
    .drop-down {
      position: absolute;
      padding: 0;
      display: none;
      margin: 0;
      left: 0;
      z-index: 0;
      
      li {
        position: relative;
        float: none;
        
        a {
          border-top: none;
          width: 150px;
          
          &:hover {
            background: #000000;
            color: #ffffff;
          }
        }
      }
      
      li:nth-of-type(1) a {
        border-top: none;
      }
    }
  }
}

.accent {
  top: 0;
  left: 0;
  width: 0%;
  height: 100%;
  background: #000;
  position: absolute;
  transition: 0.3s ease;
}

.animate {
  width: 100%;
  transition: 0.3s ease;
}

.item:hover {
  color: #ffffff;
}
View Compiled
$("li").mouseover(function(){
 $(this).find('.drop-down').slideDown(300);
 $(this).find(".accent").addClass("animate");
 $(this).find(".item").css("color","#FFF");
}).mouseleave(function(){
  $(this).find(".drop-down").slideUp(300);
   $(this).find(".accent").removeClass("animate");
   $(this).find(".item").css("color","#000");
});

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. //cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js