How can I change the color of the Pantheon files sidebar from dark to light? I can't seem to find the CSS that controls this aspect of it. If anyone knows where to find it please let me know.
In the source code file
apt-get source pantheon-files) it seems that the
source-list classes are applied to the sidebar.
/usr/share/themes/elementary/gtk-3.0/ you have "source-list" classes defined in the files
gtk-widgets-dark.css. You should customize one or more of these.