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HTML

            
              <nav>
  <a href="#">Parent Menu</a>
  <ul>
    <li><a href="#">Link One</a></li>
    <li><a href="#">Link One</a></li>
    <li><a href="#">Link One</a></li>
    <li><a href="#">Link One</a></li>
  </ul>
</nav>
            
          
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CSS

            
              nav a{
  display: block;
  width: 10em;
  height: 2em;
  line-height: 2em;
  background: #EEEEEE;
  position: relative;
  
  font-family: 'helvetica neue', 'helvetica', 'pt sans', 'arial', sans-serif;
  font-weight: 300;
  text-decoration: none;
  color: #121212;
  text-indent: 1em;
}

nav > a{
  background: #CCCCCC;
  font-weight: 400;
  height: 2.5em;
  text-align: center;
  text-indent: 0;
}

nav > a:before{
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  border-width: .5em;
  border-style: solid;
  border-color: transparent transparent #EEEEEE transparent;
  bottom: 0;
  left: 50%;
  margin-left: -.5em;
}

nav li{
  list-style: none;
}

nav ul{
  margin: 0;
  padding: 0;
}
            
          
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JS

            
              
            
          
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