JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="accordion">
      
  <li id="one" class="files">
    <a href="#one">My Files<span>495</span></a>
    <ul class="sub-menu">
      <li><a href="#one"><em>01</em>Dropbox<span>42</span></a></li>
      <li><a href="#one"><em>02</em>Skydrive<span>87</span></a></li>
      <li><a href="#one"><em>03</em>FTP Server<span>366</span></a></li>
        <li><a href="#one"><em>01</em>Dropbox<span>42</span></a></li>
        <li><a href="#one"><em>01</em>Dropbox<span>42</span></a></li>
    </ul>
  </li>
  
  <li id="two" class="mail">
    <a href="#two">Mail<span>26</span></a>
    <ul class="sub-menu">
      <li><a href="#two"><em>01</em>Hotmail<span>9</span></a></li>
      <li><a href="#two"><em>02</em>Yahoo<span>14</span></a></li>
      <li><a href="#two"><em>03</em>Gmail<span>3</span></a></li>
    </ul>
  </li>
  
  <li id="three" class="cloud">
    <a href="#three">Cloud<span>58</span></a>
    <ul class="sub-menu">
      <li><a href="#three"><em>01</em>Connect<span>12</span></a></li>
      <li><a href="#three"><em>02</em>Profiles<span>19</span></a></li>
      <li><a href="#three"><em>03</em>Options<span>27</span></a></li>
    </ul>
  </li>
  
  <li id="four" class="sign">
    <a href="#four">Sign Out</a>
    <ul class="sub-menu">
      <li><a href="#four"><em>01</em>Log Out</a></li>
      <li><a href="#four"><em>02</em>Delete Account</a></li>
      <li><a href="#four"><em>03</em>Freeze Account</a></li>
    </ul>
  </li>

</ul>

CSS

body {margin:50px;}

/* Reset */
.accordion,
.accordion ul,
.accordion li,
.accordion a,
.accordion span {
  margin: 0;
  padding: 0;
  border: none;
  outline: none;
}
.accordion li {
  list-style: none;
}

/* Layout & Style */
.accordion li > a {
  display: block;
  position: relative;
  min-width: 110px;
  padding: 0 10px 0 40px;
  height: 32px;

  color: #fdfdfd;
  font: bold 12px/32px Arial, sans-serif;
  text-decoration: none;
  text-shadow: 0px 1px 0px rgba(0,0,0, .35);

  background: #6c6e74;
  background: -moz-linear-gradient(top,  #6c6e74 0%, #4b4d51 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#6c6e74), color-stop(100%,#4b4d51));
  background: -webkit-linear-gradient(top,  #6c6e74 0%,#4b4d51 100%);
  background: -o-linear-gradient(top,  #6c6e74 0%,#4b4d51 100%);
  background: -ms-linear-gradient(top,  #6c6e74 0%,#4b4d51 100%);
  background: linear-gradient(top,  #6c6e74 0%,#4b4d51 100%);

  -webkit-box-shadow: inset 0px 1px 0px 0px rgba(255,255,255, .1), 0px 1px 0px 0px rgba(0,0,0, .1);
  -moz-box-shadow: inset 0px 1px 0px 0px rgba(255,255,255, .1), 0px 1px 0px 0px rgba(0,0,0, .1);
  box-shadow: inset 0px 1px 0px 0px rgba(255,255,255, .1), 0px 1px 0px 0px rgba(0,0,0, .1);
}

.accordion > li:hover > a,
.accordion > li:target > a {
  color: #3e5706;
  text-shadow: 1px 1px 1px rgba(255,255,255, .2);
  
  /*background: url(../img/active.png) repeat-x;*/
  background: #a5cd4e;
  background: -moz-linear-gradient(top,  #a5cd4e 0%, #6b8f1a 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#a5cd4e), color-stop(100%,#6b8f1a));
  background: -webkit-linear-gradient(top,  #a5cd4e 0%,#6b8f1a 100%);
  background: -o-linear-gradient(top,  #a5cd4e 0%,#6b8f1a 100%);
  background: -ms-linear-gradient(top,  #a5cd4e 0%,#6b8f1a 100%);
  background: linear-gradient(top,  #a5cd4e 0%,#6b8f1a 100%); 
}

.accordion li > a span {
  display: block;
  position: absolute;
  top: 7px;
  right: 0;
  padding: 0...