title: ZK - changing font-size of a tab
body: <p>I want to change the font-size of the text in a tab.
  This does not work:</p>
  
  <pre><code>    &lt;zk&gt;
      &lt;style&gt;
              .xxx { 
                  font-size: 28px;  
              } 
      &lt;/style&gt;
  
      &lt;vlayout style="padding:20px"&gt;
          &lt;tabbox width="100%"&gt;
              &lt;tabs&gt;
                  &lt;tab label="Tab 1" sclass="xxx"/&gt;
                  &lt;tab label="Tab 2"/&gt;
                  &lt;tab label="Tab 3"/&gt;
              &lt;/tabs&gt;
              &lt;tabpanels&gt;
                  &lt;tabpanel&gt;This is panel 1&lt;/tabpanel&gt;
                  &lt;tabpanel&gt;This is panel 1&lt;/tabpanel&gt;
                  &lt;tabpanel&gt;This is panel 1&lt;/tabpanel&gt;
              &lt;/tabpanels&gt;
          &lt;/tabbox&gt;
  
      &lt;/vlayout&gt;
  
  &lt;/zk&gt;   
  </code></pre>
  
  <p>What am I doing wrong?</p>