I faced the same problem and it goes bad when you open a website on mobile and other devices.
I found that changing margin in Hero settings from 12% to 90px i.e. instead of % use px where px is the size of margin, add a nice margin so it stays below menu contents, do experiment with size value.
also, there is a way to reduce size in css file, go to style.css scroll to line 5392.
for changing the background, go to hero settings and you will find few options there.
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This reply was modified 7 years, 2 months ago by hsetips.
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This reply was modified 7 years, 2 months ago by hsetips.