title: Drop-down menu doesn't show up when mouse is over the button
body: <p>I tried to create a horizontal menu that includes a drop down menu for one of the menu buttons (about me). So far, I tried the following:</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;body&gt;
      &lt;div id="main"&gt;
          &lt;div class="menubar"&gt;
              &lt;h2 id="h2"&gt;Alex&lt;/h2&gt;
              &lt;hr class="style-two" /&gt;
              &lt;ul&gt;
                  &lt;li&gt;&lt;a href=""&gt;home&lt;/a&gt;&lt;/li&gt;
                  &lt;li&gt;
                      &lt;a href=""&gt;about me&lt;/a&gt;
                      &lt;ul&gt;
                          &lt;li&gt;&lt;a href=""&gt;employment           &lt;/a&gt;&lt;/li&gt;
                          &lt;li&gt;&lt;a href=""&gt;relevant experience  &lt;/a&gt;&lt;/li&gt;
                          &lt;li&gt;&lt;a href=""&gt;education            &lt;/a&gt;&lt;/li&gt;
                      &lt;/ul&gt;
                  &lt;/li&gt;
                  &lt;li&gt;&lt;a href=""&gt;linkedin&lt;/a&gt;&lt;/li&gt;
              &lt;/ul&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  
  
  &lt;/body&gt;
  </code></pre>
  
  <p>CSS code:</p>
  
  <pre><code>&lt;style type="text/css"&gt;
  #title {
      padding: 3px 15px;  
      font-family:"Courier New", Courier, monospace;
      color: #000;
      font-size:40px;
      text-align: center;
  }
  #main {
      width: 100%;
      background-color: #565656;
      text-align: center;
      font-family:"Courier New", Courier, monospace;
  }
  
  .menubar {
      margin: 0 auto;
      width: 700px;
      background-color: #FFF;
      z-index: 2;
      text-align: center;
      padding: 0;
      font-size: 0.9em;
  }
  
  ul {
      list-style-type: none;
      padding: 0;
      overflow:hidden;
  }
  
  ul li {
      z-index: 4;
      display:inline-block;
  }
  
  ul a {
      color: #000000;
      margin: 0 auto;
      display: block;
      text-align: center;
      text-decoration: none;
      margin: 0;
      padding: 3px 15px;
  }
  
  ul a:hover {
      color: #ff9999;
      margin: 0px 0px;
      padding: 3px 15px;
      background-color: #fff;
  }
  
  
  ul li ul {
      display: none;
      position: absolute;
      float: left;
      width: 150px;
      list-style-type: none;
      padding: 0;
  }
  
  ul li ul li {
      background-color: #ffffff;
      border-width: 0 0px 0px 0px;
      z-index: 100;
  }
  
  ul li ul li a {
      width: 200px;
      color: #03C;
      text-align: left;
      margin: 0px 0px;
      padding: 3px 15px;
  }
  
  ul li ul li a:hover {
      color: #3C0;
      background-color: #FFF;
  }
  
  
  
  hr.style-two {
      border: 0;
      height: 1px;
      width: 100%;
      align: left;
      background-image: -webkit-linear-gradient(right, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0)); 
      background-image: -moz-linear-gradient(right, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0)); 
      background-image: -ms-linear-gradient(right, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0)); 
      background-image: -o-linear-gradient(right, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0)); 
  }
  
  hr.style-six {
      border: 0;
      height: 0;
      border-top: 1px solid rgba(0, 0, 0, 0.1);
      border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  }
  
  #h2 { 
      font-weight:normal; 
      padding: 3px 0px;   
      margin: 0px 0px 0px 0px;
      font-family:"Courier New", Courier, monospace;
      color: #000;
      font-size:40px;
      text-align: center;
      float: none;
      display: block;
  }
  </code></pre>
  
  <p>The fiddle link to the above code is <a href="http://jsfiddle.net/vnLgZ/" rel="nofollow">here</a>.</p>
  
  <p><strong>if I remove <code>display: none</code> in the section of code below, the sub menu shows up. Not sure what is happening here. Any pointers would be appreciated!</strong></p>
  
  <pre><code>ul li ul {
      display: none;
      position: absolute;
      float: left;
      width: 150px;
      list-style-type: none;
      padding: 0;
  }
  </code></pre>