Hygiene: Remove dead css

Change-Id: If4ce83c143c0e6194f0b69dd40eae9e57b74a6b1
Hide the user button on the login screen

Bug: 51579
Change-Id: I491f91971187d07cf7914d5f0a9d74e8068c78b2
Merge changes I491f9197,If4ce83c1

* changes:
  Hide the user button on the login screen
  Hygiene: Remove dead css