Layout question (GeneratePress + Toolset)

Hi,

I'm using GeneratePress and Toolset. I have a few questions:
1. I noticed that pages are included in the container (the one with white background), while archives are not. Which class should be used to include whole archive in the same container as the page?
2. When the page size is displayed on a mobile phones, I see that the second content column has left padding (https://1drv.ms/i/s!Ajkoo-gGVQk2htRJX5RHzCP_nlngyA – red bar). Which class should be modified to remove this padding?
3. I also noticed differences between single pages and single posts. For example, there is additional margin at the top of single posts (https://1drv.ms/i/s!Ajkoo-gGVQk2htRKJXD7Psx6jIgIIw – red bar) compared to single page (https://1drv.ms/i/s!Ajkoo-gGVQk2htRLc2j_GyN-bau_EQ). I know I can use code inspector to see css, but I'd prefer to first make sure I alter right classes.
4. Is there any documentation describing css classes used in a GP theme?

Thanks