I don’t know the css code of it, but using vw and vh (view width, view height) works better than % or px.
if this doesn’t solve the problem I’d recommend creating a javascript that adapts the width and height to the viewers needs.
If nothing works for you, you can also checkout my edit of the same script. It has a different design to it but its based of the same basics 
(with a little more optimisation)
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