Avoid two scrollbars

[tnobody]

As a user i dont want to get/see more than one (vertical) scrollbar in a single page (and no horizontals at all)

Related Pages are:
tests/editor/:name/design
tests/editor/:name/sources
tests/editor/:name/run
tests/run
configuration/spring-context

Possible Solutions: Sticky / Fixed "header" components in content area (with flexbox?)