I can tell you how to remove that gap if you are you happy to make a small change to the screen.css file?
Basically, go to line 105 in screen.css and change the height value to something a bit less. Re-upload the file and refresh your site to see if that value is ok.
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Basically, go to line 105 in screen.css and change the height value to something a bit less. Re-upload the file and refresh your site to see if that value is ok.