White space between the header and the footer.

How do I remove the white space between the header and the footer I saw a couple of other posts and tried several solutions that was presented but didn’t work. I’m put a picture showing the problem on this pastbin: https://picpaste.com/Captura_de_tela_de_2016-03-01_23_16_49-Ck1yORml.png

I haven’t put a link for my website because isn’t published yet.