Minor Problem With Main Content Block

I am using 4.0.3 and recently used the customize theme function to adjust background colors etc. Something happened to the main content block that I cannot repair or reverse.

First, I changed the top header and bottom footer to full width OFF and transparency OFF.

Then, I changed Content to full width off, but it remains at full width. It’s not a big deal, but I would like it to function as specified. The transparency is also off for this section. Any ideas how to repair this? It seems strange, maybe a bug. I’ve inspected it and it appears that a margin is set for the content section, but I can’t find where to edit this in the templates.

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