JSFiddle - React, Tailwind, and code Playground

by TJTR

HTML

<div style="box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.08), 1px 1px 4px rgba(255, 255, 255, 0.08) inset;border: 1px solid #DDD;
overflow: auto;
background-color: #FFF;
text-align: center;
border-radius: 10px;
width:100%;
height:50px;

">
<ul class="dropdown">
  <li>Section1
    <ul>
      <li>Link</li>
      <li>Link</li>
      <li>Link</li>
      <li>Link</li>
      <li>Link</li>
    </ul>
  </li>
</ul>
</div>

CSS

<style>

body {
  font-family: 'Lucida Grande', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  padding: 20px 50px 150px;
  font-size: 13px;
  text-align: center;

}

.dropdown {
  text-align: left;
  display: inline;
  margin: 0;
  padding: 0px 4px 0px 0px;
  list-style: none;
}
.dropdown li {
  font: bold 12px/18px sans-serif;
  display: inline-block;
  margin-right: -4px;
  position: relative;
  /*padding: 15px 20px;*/
  background: #fff;
  cursor: pointer;
  -webkit-transition: all 0.2s;
  -moz-transition: all 0.2s;
  -ms-transition: all 0.2s;
  -o-transition: all 0.2s;
  transition: all 0.2s;
}
.dropdown li:hover {
  background: #555;
  color: #fff;
}
.dropdown li ul {
  padding: 0;
  position: absolute;
  top: 18px;
  left: 0;
  width: 150px;
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
  display: none;
  opacity: 0;
  visibility: hidden;
  -webkit-transiton: opacity 0.2s;
  -moz-transition: opacity 0.2s;
  -ms-transition: opacity 0.2s;
  -o-transition: opacity 0.2s;
  -transition: opacity 0.2s;
}
.dropdown li ul li { 

  display: block; 
  color: #000;
  
  padding-bottom: 5px;
}
.dropdown li ul li:hover { background: #666; }
.dropdown li:hover ul {
  display: block;
  opacity: 1;
  visibility: visible;
}

</style>