The basic color green is preset for menus and icons. However, you can change to a different color at any time. The JSON configuration file supports the following data set to change the base color, for example to the color blue:

To copy the code to the clipboard click on the icon -> 
"theme": {   "primaryColor": "blue"}

The colors can be named according to supported X11 color names in hex code.

A list of all supported colors can be found on the following websites:

https://en.wikipedia.org/wiki/X11_color_names

https://www.w3.org/TR/css-color-3/