Can the Wiki CSS hide nav bar links?

Can the Wiki CSS hide nav bar links?

I'd like to remove the links from the wiki that allow people to see their dashboard, and thus create their own wikis.
I am super-admin, and I want all domain users only using 1 wiki - the domain-shared one that I set up. I have non-tech savvy users who don't know when they are on their own wiki, or the domain one.
Since this is not a policy that I can set in the Control Panel, I was wondering if I could use CSS to just make those links invisible. Its a band-aid, but it would decrease confusion here.
(I'm a zoho convert - I'm trying to get more people using it, but the confusing UI is keeping people away....The super admin needs more control to restrict zoho use - please don't become like MS office - they have too many buttons, too many features. sometimes less is more.)