title: div containers inside w3-tab (Navigation as Page Tabulators) W3 CSS
body: <p>I am new to html and css in particular. I found the W3.CSS template and trying to modify it. I am trying to make a navigation toolbar as in this example:
  <a href="http://www.w3schools.com/w3css/tryit.asp?filename=tryw3css_nav_topnav_tab" rel="nofollow">http://www.w3schools.com/w3css/tryit.asp?filename=tryw3css_nav_topnav_tab</a></p>
  
  <p>but I want to place additional "containers" inside each of the 3 main ones. However, the additional <code>&lt;div&gt;</code> are never shown. Here is an example: </p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;title&gt;W3.CSS&lt;/title&gt;
  &lt;meta name="viewport" content="width=device-width, initial-scale=1"&gt;
  &lt;link rel="stylesheet" href="http://www.w3schools.com/lib/w3.css"&gt;
  &lt;body&gt;
  
  &lt;div class="w3-topnav w3-red"&gt;
    &lt;a href="#link1"&gt;London&lt;/a&gt;
    &lt;a href="#link2"&gt;Paris&lt;/a&gt;
    &lt;a href="#link3"&gt;Tokyo&lt;/a&gt;
  &lt;/div&gt;
  
  &lt;div class="w3-tab"&gt;
  &lt;div id="link1" class="w3-container"&gt;
    &lt;h2&gt;London&lt;/h2&gt;
    &lt;p&gt;London is the capital city of England.&lt;/p&gt;
    &lt;p&gt;It is the most populous city in the United Kingdom,
    with a metropolitan area of over 13 million inhabitants.&lt;/p&gt;  
  
  &lt;div class="w3-row"&gt;
  &lt;div class="w3-container w3-half"&gt;
      &lt;h2&gt;w3-half&lt;/h2&gt; 
      &lt;p&gt;This is a paragraph&lt;/p&gt;
    &lt;/div&gt;
    &lt;div class="w3-container w3-half"&gt;
      &lt;h2&gt;w3-half&lt;/h2&gt; 
      &lt;p&gt;This is a paragraph&lt;/p&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  &lt;/div&gt;
  &lt;div id="link2" class="w3-container"&gt;
    &lt;h2&gt;Paris&lt;/h2&gt;
    &lt;p&gt;Paris is the capital of France.&lt;/p&gt; 
    &lt;p&gt;The Paris area is one of the largest population centers in Europe,
    with more than 12 million inhabitants.&lt;/p&gt;
  &lt;/div&gt;
  &lt;div id="link3" class="w3-container"&gt;
  &lt;h2&gt;Tokyo&lt;/h2&gt;
    &lt;p&gt;Tokyo is the capital of Japan.&lt;/p&gt;
    &lt;p&gt;It is the center of the Greater Tokyo Area,
    and the most populous metropolitan area in the world.&lt;/p&gt;
  &lt;/div&gt;
  &lt;/div&gt;
  
  &lt;/body&gt;
  &lt;/html&gt; 
  </code></pre>