yumm bootstrap 4 code example

Example: yumm bootstrap 4

<nav class="yamm navbar navbar-expand-lg navbar-light bg-light">
...
     <ul class="navbar-nav">
       <li class="nav-item dropdown">
         <a href="#" class="nav-link dropdown-toggle" data-toggle="dropdown">Dropdown</a>
         <div class="dropdown-menu">
           <div class="yamm-content">
             ...
           </div>
         </div>
       </li>
     </ul>
...
</nav>