title: How to apply css class to a component element when it's created by router-outlet?
body: <p>I have DOM that looks something like this:</p>
  
  <pre><code>&lt;app&gt;
      &lt;router-outlet&gt;&lt;/router-outlet&gt;
      &lt;project&gt;...&lt;/project&gt;
  &lt;/app&gt;
  </code></pre>
  
  <p>where <code>project</code> element is inserted by the router.</p>
  
  <p>How do I add a class to this element?</p>