Folks are telling you how to post. I dont think that is what you meant.
You can adjust brightness and size on your browser, but that is not going to make typeface “bold” throughout.
Without trying to sound snarky, have you considered getting higher magnification reading glasses? I’ve been fighting it myself, but blue block reading glasses are very useful from time to time.
In response to your post on blue block glasses:
I gotta use blue blocker glasses- it was getting so my eyes were stinging at the end of the night after being on co Peter. Couldn’t figure it out til, someone ementioned it might be blue light. Purchased blue blocker glasses and the problem went away completely.