title: Google amp page: how to add close button to amp-image-lightbox?
body: <p>How to add close button to <code>amp-image-lightbox</code>? Its closed by clicking outside of image, but what should be if aspect ratio match display? Code piece follow:</p>
  
  <pre><code>$rnd = rand(10000,20000);
  $res = '&lt;amp-img on="tap:lightbox'.$rnd.'" role="button" tabindex="0" src="'.$src[1].'" width="'.$width.'" height="'.$height.'" layout="intrinsic" '.$style.'&gt;&lt;/amp-img&gt;';
  $res.= '&lt;amp-image-lightbox id="lightbox'.$rnd.'" layout="nodisplay"&gt;&lt;/amp-image-lightbox&gt;';
  </code></pre>