Footer Colour Issues


I’m trying to change the colour of my footer to a grey colour, it’s currently black. But when I change the colour using the visual editor i get a pattern across the footer that I can’t get rid of. I can’t find it in the CSS either to remove it.

This is the case on every colour besides Black and White, is there any way to remove this pattern?

Could you please clarify what do you mean by “pattern” ?

It looks like lots of tiny white dots going across the whole footer, you can see them on the image I attached. I just want it to be a plain colour block