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Un-maximize your browser window, then resize it to 9 inches wide.

Too lazy to do that. Need a button

In Firefox (and I think many browsers) there's a button. It's called "reader view". It looks like a page with some text on it.

Thank you this is exactly what I'm looking for

You have a button. It's that button right next to the window's close button.

Got a screenshot? I don't see it. My screen reader shows me a minus and an X

On Firefox, this button is Ctrl+Alt+R

Some months ago I did https://danluucination.github.io/, which is danluu site but with some CSS

Something we can all agree on.

Copy your favorite classless css framework into this: https://www.squarefree.com/userstyles/make-bookmarklet.html - drag the bookmarklet into your favorite bar, and there you are :)

body { max-width: 9in; }

Could be a minimalistic starting point ;)