Change Background

I use grafana dashboards with a display that needs black background. Before I have changed the values in /usr/share/grafana/public/css/ This works file. However after upgrading to version 5 it is now gray again. Tried to change in the sass folder an the dark theme but can not get this working. Where am I suppose to change if I only need a black background.

The path to the grafana.dark.css in 5.0 is now: /usr/share/grafana/public/build/

not able to access it

Do you mean you do not have access to your grafana server files? Then it will be hard to change anything.