Can you get a full-width background, but with the content NOT full-width?

I'm creating a page on my site, and I want each section to have a different coloured background. The way I've done that is I've put that section's content into a group that's full-width, and given that group the coloured background. However, this is making the CONTENT go full-width too, and I DON'T want the content to be full-width.

I've tried putting the content in a row inside the Group, and making the row standard width, but this still hasn't worked.

Is this possible?