Sometimes I find I get a white gap just above the footer that I can't get rid of, even by using the zoom out delete space remover tool. Wix support gave me this great info on how it's done, thanks Wix! I wanted to share in case you're looking for this same fix.
This gap apparently occurs on some of the page body designs of templates. If you find that you have the footer gap, to remove the gap, you should select a different preset for the page body design.
To remove the gap:
Click the page body.
Click Change Page Design.
Hover over the presets and select a design which removes the gap, or select the No Color option.
You can then use the footer's drag handle to drag it upwards and close the gap
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