#2 FAQ fox settings

docs/web/docs/FAQ.md

@@ -1133,6 +1133,17 @@ If your computer supports it, run SUMO using the integrated graphics card (Contr
 
 Install the [Noto Fonts](https://en.wikipedia.org/wiki/Noto_fonts) package for your distribution.
 
+### How can I change the color theme of sumo-gui or netedit?
+
+SUMO uses the fox-toolkit which permits [system-wide and per-application settings](http://www.fox-toolkit.org/registry.html) that can be customized by the user.
+Under windows these settings must be configured using `regedit` i.e. at the registry location `Computer\HKEY_CURRENT_USER\SOFTWARE\sumo-gui\SUMO GUI\SETTINGS`
+
+Supported color entries are: bordercolor, basecolor, hilitecolor, shadowcolor, backcolor, forecolor, selforecolor, selbackcolor, tipforecolor, tipbackcolor, selmenutextcolor, selmenubackcolor
+    supported color values are RGB hex codes (#aea395) as well as symbolic names (red). A full list of colornames can be found in [`FXColorNames.cpp`](https://github.com/DLR-TS/SUMOLibraries/blob/main/fox-1.6.57/src/FXColorNames.cpp).
+The font is configured with: normalfont (i.e. normalfont="Times,100")
+Further config entries are: typingspeed, clickspeed, scrollspeed, scrolldelay, blinkspeed, animspeed, menupause, tippause, tiptime, dragdelta, wheellines, scrollbarsize, displaygamma
+
+
 ## Upgrading
 
 ### How do I upgrade SUMO?