A lot of websites use white as the background color, which is perfectly fine, and should remain as is.
However I think we can be offered an option to 'turn down the glare'. I understand there IS a place to manage colors and themes. But I am not against that overhaul option because it overrides colors completely as to make the web pages look horrid.
I would like something like a 'tint' scale so that these pages don't blind us unnecessarily, like offer a gray tint in 15% increments; in fact, include a place to store commonly viewed webpages that will always use this tint e.g. wikipedia sites or google results pages.