I agree, that level of white usually gives me eye strain after several minutes, even in a well lit room. The readability mode of Firefox for example uses #eeeeee for the text and #333333 for the background [1], I'd suggest using the same tones which are still very high contrast but don't cause nearly as much strain.

[1]: https://www.theregister.co.uk/2019/07/10/firefox_68_arrives_...