title: Ionic 3 image broken on production
body: <p>I have this code working locally:</p>
  
  <pre><code>  background-image: url('/assets/images/board.png');
  </code></pre>
  
  <p>But not on production:
  <a href="https://play.google.com/store/apps/details?id=mind.your.maths&amp;hl=en_GB" rel="nofollow noreferrer">https://play.google.com/store/apps/details?id=mind.your.maths&amp;hl=en_GB</a>
  The image doesn't display at all. It looks like the problem is only with the css, not facing any issue with html images on same folder</p>