Lockinfo Theme question

[Massie]

Hi all--can anyone help with a Lockinfo theme question? I'm trying to change the default background and can't find the right piece of code. I'm talking about the background behind the calendar dates on the Clock plugin, behind your email subjects, and behind the weather.

I know I can adjust the transparency in Settings, but I can't seem to change the color. I replaced the relevant section_subheader files, which I thought would do it, but haven't had any change...