Using chrome Version 63.0.3239.108 (Official Build) (64-bit) and Firefox 58.0 (64-bit) on Ubuntu 16, there is an intermittent bug with full screen display. When the problem happens it is because of the following code:
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When it shows the slider full screen (as expected), the code looks as follows:
``
Also, your demo site is down for this viewer in England - the CDN (http://canvashtml-cdn.semicolonweb.com/) is not serving any assets.
Additional info:
When the full screen only half loads (500px), you can resize the viewport and go back to full screen and the size resets correctly, but when you reload the page, it's back to bugged state - maybe this helps in debugging.
