Nothing happens, the color remains the basic background color of the theme.
Environment
Windows 7, Chromium 55.0.2900.1 (SRWare Iron)
Additional information
If I use the menu to apply the colour it works fine. I can remove the color and switch to other colors. Itās only the keyboard short-cut for colour 2 that doesnāt seem to work.
In Chrome(ium) you can use the internal URL chrome://extensions/configureCommands to see what keyboard shortcuts are in use, and in my case I can see that Ctrl+Shift+2 is already used by Streamkeys extension to toggle mute.
I ran into the problem while developing this feature too. Ctrl+Shift+0 just doesnāt work, and thatās why we opted for Ctrl+Shift+Backtick instead. I just checked, Ctrl+Shift+0 isnāt taken by any extensions, but I canāt find any information on the Chrome official documentation either