Backend background color is limited to height:100%
In several backend screens where there is need to scroll, the background color stops at 100% height. This can be seen for example in the Login screen (dark gray ends abruptly when scrolling down), the Element browser (gray background) and others.
This is a regression introduced with #47920 (adding the normalizer.css) and needs to be fixed until 6.2 release.
The UX team noted that also: https://projects.invisionapp.com/share/H2IU7YVE#/screens/10263303/comments/6159625
[BUGFIX] Fix height of body in backend
The body-tag had 100% height in the backend. In views, where scrolling
is possible (e.g. login screen in a small window), this made the
background-color stop too soon.