Which config setting?

[Max]

How can I change the background color used to highlight the words found as a result of doing a search of the entire tree.  Currently the color is so dim (light) on my Windows 8.1 machine that it's difficult to identify the occurrences of the words found.  I'd like to use a bright yellow sort of highlight but can't see where to specify the color change.  I'm currently using the latest Beta 0.7.9 of Keepnote for windows.  Can any GTK/Python experts point me in the direction of the correct file and setting?