Suggestion for your theme

I am struggling to find the right width spacing for my blog articles. I had posted another question awhile back about layout elements outside of the 1/1, 1/2, 1/5, etc. and was told that it was not possible, so I have a suggestion.

The 1/1 or full width content is too wide. 4/5 seems like just the right width for blog content, but if I want to center that I cannot. I suggest either offering a way to increase the margins of your full-width content (without affecting the rest of the pages), or offering a 1/10 spacer so 4/5 can be centered.

I included an example blog that I would like to replicate the width spacing of.

Thanks,
Ryan