title: Two div on the top, one div on the bottom
body: <p>That would look like:  </p>
  
  <pre><code>#div1 #div2
    #div3  
  </code></pre>
  
  <p>I tried to set <code>#div1</code> and <code>#div2</code> to <code>float left</code>, but some part of <code>#div3</code> come to top. What' the problem here?</p>