title: How to align container to body center?
body: <p>I use following code:</p>
  
  <pre><code>&lt;body&gt;
  &lt;div style="width:450px; height:600px; align-self: center; background-color: lightgreen;"&gt;&lt;/div&gt;
  &lt;/body&gt;
  </code></pre>
  
  <p>and get</p>
  
  <p><a href="https://i.stack.imgur.com/pUQwP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pUQwP.png" alt="enter image description here"></a></p>
  
  <p>I hope align green part to center, how to do it?</p>