title: align div to another div
body: <p>I have two divs, like the image attached. Mi problem is that div2 didn't go under div1 (when div1 finish), as shown in image1, but remains in column (like the second image attached).</p>
  
  <p><img src="https://i.stack.imgur.com/isqkh.gif" alt="first image">
  <img src="https://i.stack.imgur.com/sm9K6.gif" alt="second image"></p>
  
  <p>div1 css is:</p>
  
  <pre><code>width: 391px;
  height: 380px;
  float: left;
  margin-right: 10px;
  </code></pre>
  
  <p>while div2 css ishas no css (i don't know what to insert).</p>
  
  <p>How can i do?</p>
  
  <p>Thanks, Mattia</p>