JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<div class="container">
    <div class="pull-right">right button</div>
   <ul class="menu">
        <li class="menu-item sub-menu"><a href="#">CSS</a></li>
        <li class="menu-item sub-menu"><a href="#">HTML</a></li>
        <li class="menu-item sub-menu"><a href="#">jQuery</a></li>
        <li class="menu-item sub-menu"><a href="#">PHP</a></li>
        <li class="menu-item sub-menu"><a href="#">WordPress</a></li>
</ul>
    
    
    
    
    
    Lorem ipsum    Lorem ipsum    Lorem ipsum    Lorem ipsum <br>
    Lorem ipsum    Lorem ipsum    Lorem ipsum    Lorem ipsum <br>
    Lorem ipsum    Lorem ipsum    Lorem ipsum    Lorem ipsum <br>
    Lorem ipsum    Lorem ipsum    Lorem ipsum    Lorem ipsum <br>
    Lorem ipsum    Lorem ipsum    Lorem ipsum    Lorem ipsum <br>
</div>

CSS

.menu
{
  background:#ccc;
  top: 50px;
  right: 0px;
  position: absolute;
  clear: both;
}