title: ui Semantic apply dimmer in modal
body: <p>I am using Angular 2 with ui Semantic to create the front-end of an application. I create my on own modal, so I am not using the modal code of ui Semantic, but I am using the style HTML CSS of then. Something like this:</p>
  
  <pre><code>&lt;div class="ui modal"&gt;
    &lt;div class="header"&gt;
      Some Header
    &lt;/div&gt;
    &lt;div class="description"&gt;
      &lt;div class="ui header"&gt;
        Some description
      &lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="actions"&gt;
      &lt;div class="ui black deny button"&gt;
        Some action
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Just copy the code from their example. But the point is, I would like to know how to apply the dimmer (make the background dark when I open the modal) using ui semantic. There's any way to do that? </p>