JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="dark_menu">
  <li><a href="#" class="selected">Home</a></li>
  <li>
  <a href="#">Portfolio</a>
  <!-- Sub Menu Begin -->
  <ul>
  <li><a href="#">Lorem ipsum dolor</a></li>
  <li><a href="#">Donec lorem</a></li>
  <li><a href="#">Lorem ipsum dolor</a></li>
  <li><a href="#">Donec lorem</a></li>
  </ul>
  <!-- Sub Menu End -->
  </li>
  <li>
  <a href="#">Blog</a>
  <!-- Sub Menu Begin -->
  <ul>
  <li><a href="#">Lorem ipsum dolor</a></li>
  <li><a href="#">Donec lorem</a></li>
  <li><a href="#">Lorem ipsum dolor</a></li>
  <li><a href="#">Donec lorem</a></li>
  </ul>
  <!-- Sub Menu End -->
  </li>
  <li><a href="#">Contact</a></li>
  </ul>

CSS

/*------------------------------------------*/
/*--------- Dark Menu Styles Begin ---------*/
/*------------------------------------------*/

  /* Main Dark Menu Unordered List First Level Style */
  ul.dark_menu {
  list-style: none;
  padding: 0;
  font-family: Arial;
  font-size: 14px;
  line-height: 14px;
  }

  /* Clears all floated List Items */
  ul.dark_menu:after {
  content: "";
  clear: both;
  display: block;
  overflow: hidden;
  visibility: hidden;
  width: 0;
  height: 0;
  }

  /* First Level List Items Style */
  ul.dark_menu li {
  float: left;
  margin: 0 0 0 10px;
  position: relative;
  }

  /* First List Item in First Level Style */
  ul.dark_menu li:first-child {
  margin: 0;
  }

  /* List Items Links Style */
  ul.dark_menu li a, ul.dark_menu li a:link {
  color: #161312;
  text-decoration: none;
  display: block;
  padding: 10px 26px;
   
  /* Text Shadow */
  text-shadow: 0 1px 0 #4b433e;
   
  /* Gradient Background */
  background: #362f2c; /* Old browsers */
  background: -moz-linear-gradient(top, #362f2c 0%, #282321 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#362f2c), color-stop(100%,#282321)); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top, #362f2c 0%,#282321 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top, #362f2c 0%,#282321 100%); /* Opera11.10+ */
  background: -ms-linear-gradient(top, #362f2c 0%,#282321 100%); /* IE10+ */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#362f2c', endColorstr='#282321',GradientType=0 ); /* IE6-9 */
  background: linear-gradient(top, #362f2c 0%,#282321 100%); /* W3C */

  /* Border Radius */
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  border-radius: 4px;

  /* Box Shadows */
  -webkit-box-shadow: inset 0 1px 0 #564b46,
  0 1px 1px #181514;
  -moz-box-shadow: inset 0 1px 0 #564b46,
  0 1px 1px #181514;
  box-shadow: inset 0 1px 0 #564b46,
  0 1px 1px #181514;

  /*...