Hey Docker Forums team,
There is a (small) CSS bug with the custom navigation on the forums. If you click e.g. the Search icon on the header, and then select options, you’ll get an overlay information with advanced search options.
Because of the z-index setting of the custom navigation the translucent background won’t cover the navigation though.
If you want to fix this, you could change the css for the #navmenuv to use z-index: 1001 instead. (Or any z-index below 1050, which is the value for the #discourse-modal.)
If this is on purpose, just ignore this post 
~ Marko