How to adjust website body width?

I would like to know how to change the width of the body of my site, and maintain the proportion of the posts. I made an example by modifying the page by “Inspect Element”.

I tried changing the “html” but did not succeed. I changed the Blogger option but the posts are with the square thumbnail.

I did an illustration of how I want to leave the appearance of my Blog.

Color Blue = Current state.

Red Color = When I change through Blogger.

Color Green = Result I want.

Gray color = Blogger option.

Please help me, this is the only site that has something about Blogger’s Empório Theme, I was able to solve several problems by the topics of this forum, only this problem that I can not solve.

And I apologize for my mistake in English, I’m using “google translator” because I’m from Brazil and I only speak Portuguese.

My website: https://www.canalraplay.com

canal raplay help

You can adjust with form your theme if your a blogspot user. You can read about it here. Naijatruevoice.com.ng

I’ve done it that way, as I explained above. But the thumbnails of the posts are square. I want a way to change via “html” or “css”.

Or, if possible, keep the thumbnail size of the posts.

Check www.ogbongeblog.blogspot.com if it is designed the way you want because I don’t really understand what you want to achieve.

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Please how do I adjust the width of newsmag/newspaper themes on WordPress?

Contact the theme developer