The fonts are too small and pale for my old eyes.
Depending on your OS/browser you can increase font sizes for webpages, e.g.
If you use a different browser, type "increase font size [browsername]" in Google and you will find some instructions I'm sure
Lessons Userstyle to get some things of the old look back: https://www.duolingo.com/comment/24969319
The link in your comment points to this thread; I think you meant to point to this
I can't increase the font size in the smartphone app and it's completely necessary for some people. Please add that option!