I've been doing a lot of work tweaking the Forum Styles over the past couple days trying to make them more readable and 'polished'
I increased the font size on most things and added spacing in many areas, indenting the post content, etc.
In the Dark theme there were smileys missing, I got them working in there.
Give the styles a try and let me know if I missed anything. You can try them out at the bottom of the page and save your default choice in your 'My Stuff' - Edit Preferences
I change the Default setting from time to time, sometimes for Seasons or Holidays (Valentines Day, Easter) . If you have your preference (in 'My Stuff') set to 'Default' then you will see the changes. If you select any thing else you will always see the style you choose.