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If you can't see the screenshot in full resolution, click here
So you may or may not see that the background color "behind" the text (including the linum) is lighter (#20292D) than the window's background color (#20282C).
Please note that the background color set in my theme is the latter, #20282C, as seen here.
My question is, what is causing the text to have a lighter background color and how can I make it to be the same as the window's color?
Put your cursor on a character in the text, and hit C-u C-x =. That will tell you what face, if any, is used at that position.
Then click that face name in buffer *Help* (or use M-x customize-face) to look at the definition of that face. Probably it specifies a background, and that background color is similar to but not quite the same as the background color of the frame.
You can check the background color of the frame by M-x pp-eval-expression RET (frame-parameters) RET - look for background-color.
Use M-x customize-face to remove the background attribute from the face (or make it the same as the background of face default, which is used for the frame, including non-text areas).
