User:CmdrDan/Stylin Your Userpage

Trick out your user page
should start with: What's a user page?

I've clearly missed something...for I'm lost when it comes to styling, especially when compared to: https://en.wikipedia.org/wiki/User:Pharos https://en.wikipedia.org/wiki/User:Dispenser https://en.wikipedia.org/wiki/User:Aude https://meta.wikimedia.org/wiki/User:Anonymous_Dissident https://en.wikipedia.org/wiki/User:DragonflySixtyseven What's causing the highlighting, above?