I created a Stylish user style for the forum, because I think it lacks to separate certain content from each other, like links from regular text, quotes from the message and the signature from the post body. The style adds some borders and alters background as well as link colors.
Preview images are in my blog post
Stylish for FF: https://addons.mozilla.org/de/firefox/addon/stylish/
Stylish for Chrome: https://chrome.google.com/webstore/detail/stylish/fjnbnpbmkenffdnngjfgmeleoegfcffe?hl=en
Style on userstyles.org: https://userstyles.org/styles/115382/pw-vanilla-readability-upgrade
Enjoy and feel free to alter it!