Click on it with right mouse button ---> inspect element. You should see what element is there, and under which class so you can delete it. If not tweak padding or margin on footer and post above it.
You can edit that live in your browser so you see how it looks and what values to use
EDIT: Didnt noticed you are using, Elementor. Then just click on that section and in left toolbar there should be options for padding and margin
is your page template set to "Elementor Full Width"?
I tried but no change.i would right click on your page and open the navigator toolbar, then click each section that you have at the bottom and go to the 'advanced' tab on the left-hand column and set the top and bottom margins to 0 on all of them.
you have the posts highlighted. click the "section" in the navigator; also your margins are not set to zero, they are blank which means its set to default. manually overrride it and enter the number 0.
Glad I could help. Take care.Yes it is now, thank you very much.