You can choose the patterns for the site background from the available options in appearance> theme settings> design tab. Click the relevant radio boxes to choose your desired pattern and save.

I need patterns on the top header where is the logo – on the dark brown background.

To add space under the logo for example, you’d use something like the following piece of code.

I need only centre the logo and not a margin between top header where is the logo and navigation.
How i can do it?