<ul>
   <li>Home</li>
   <li class="noUD">|</li>
   <li>About Us</li>
   <li class="noUD">|</li>
   <li>Contact Us</li>
</ul>

.noUD {
  text-decoration: none;
}

#element {
    background-color: #007788;
    width: 800px;
    height:200px;
    position: absolute;
    left: 100px;
    top: 10px;
    margin: 10px;
    padding: 5px;
    border-bottom: 4px solid #003355;
    border-radius: 5px;
    box-shadow: 0 0 10px grey;
    box-sizing: border-box;
}