How to change the background color of visualisations (Multigraph, ...)

Hi!
I have installed EmonCMS on an Raspberry Pi and I am verry happy about it.

Now I am trying to beautify the dashboards a little bit.

First I changed the background color to black.
But all the graphs have got a white background. I’d like to change the BG color to black (or transparent?) and the text should be white.
How can I do this?

I did some research and found the flot/API, there is a procedure called GRID: {}.
In multigraph.js there is a call in the function plot() to a procedure named grid:{}, but if I add there backgroundcolor: “#aabbcc nothing happend… (I restarted my RasPi after this without success).

So I am not really a javascript guru but I hope someone can help me :slight_smile:

Nice greetings from freezing Austria.
Armin