Hi! This is driving me crazy!

Sign in from Windows 10 or Suse Linux Desktop 12 is impossible!
The page is stripped from 'styles', no banner and Sign in isn't a
button, just text.
Try:
http://password.avans.nl
You'll get redirected to
https://login.avans.nl/nidp/idff/sso...contract%2Furi
No Sign in button!

https://login.avans.nl/nidp/app/login
This is what it should look like

It's not browser specific.
We're on 4.2.1.0-29 b.t.w.
Anyone?