I sympathize. It can be a readability problem. I'll either quickly use inspector to at least set some max width and auto margins, or I'll hit the "reader view" in Firefox. That works pretty well for most places that I run into that aren't using CSS. Didn't the browsers used to support a "user" style sheet or some such, or otherwise let us establish default CSS?

It's too bad that CSS is yet another language tacked on top of HTML. People go to the trouble of learning HTML only to find out there is another level of detail they are asked to worry about. It took me a long time to add CSS to my own site.

I've also started to use Stylish to take care of the sites that I regularly visit that have styling that bothers me in some way.