Studio panel colors (again)

New with childthemes, but found and read this manual:
and this thread:

I must be missing something obvious, cause changing Stdio Theme BP-panel colors does not succeed. I did:
- install and activated child theme
- copied and adjusted studio/_inc/css/adminbar.css
- uploaded to studio-child/_inc/css/
No effect. Also:
- put my changes in studio-child/_inc/css/child.css
- uncommented @import url( _inc/css/child.css ); in studio-child/style.css
No effect.
O, and flushed browser cache numerous times, and tried Chrome to check.
No effect.
What am I missing?

Thanks in advance and kind regards,