title: Set background image of ionic 2 app
body: <p>I would like to set an image as a brackground of every pages of my Ionic 2 app.</p>
  
  <p>I know how to do that in the HTML or in the CSS of one page (which I could do in all of them).</p>
  
  <p>I know how to set the background color of the whole app in <code>theme\variables.scss</code></p>
  
  <pre><code>$background-color: map-get($map: $colors, $key: primary);
  </code></pre>
  
  <p>(for example)</p>
  
  <p>But it seems like doing the same with </p>
  
  <pre><code>$background-image: url('assets/images/background-image.jpg');
  </code></pre>
  
  <p>does not work. Even if that exact same line in one page's css works.</p>
  
  <pre><code>.class-name-here{
      background-image: url('assets/images/background-image.jpg');
  }
  </code></pre>
  
  <p>Would it be possible to set an image as the whole app's default background in Ionic 2/ Ionic 3?</p>