I wonder if we should discuss firstly, if it still makes sense to have side bar widgets at all (in the long term)? Otherwise we spend too much effort into something that might change in future versions.

We initially wanted to make them look pretty, but after doing a deep dive with danielbeck on the different widgets we decided to be conservative and do the minimum styling, in order to avoid breaking anything

PR created here: https://github.com/jenkinsci/jenkins/pull/4767

oleg_nenashev can you please confirm that this can be resolved?

It should have been applied in 2.240