title: How can I get the parent's parent's width in HTML with CSS?
body: <p>My HTML code is:</p>
  
  <pre><code>&lt;div id="wrapper" style="width:100%;"&gt;
      &lt;div style="width:960px;"&gt;
         &lt;div style="width:30%;"&gt;
              &lt;div&gt;Hello World!&lt;/div&gt;
         &lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>How can I set the width of "Hello World!" div same as "wrapper" div with css?</p>