title: Stylesheet does not work in mobile correctly
body: <p>I've got a stylesheet for mobile devices with this code:</p>
  
  <pre><code>/* Smartphones (portrait) ----------- */
  @media only screen 
  and (max-width : 320px) {
  /* Styles */
  }
  </code></pre>
  
  <p>but, it doesn't work on my iphone 3gs. This stylesheet works fine in browser when I resize it.</p>
  
  <p>If I set "max-width" value to a bigger number of px, for example 1000px, then it works fine.
  Why is it?</p>