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I am using the TwentyEleven template in its default, unmodified state. I am wondering how to make the section that is outlined in red in the image referenced above (basically, the header area) transparent.
If possible, I would rather receive advice that would direct me to a background color area that I could modify, which is already located in the default code for the Twenty Eleven CSS code, rather than "slap" a piece of code addendum in this same CSS template.
Referencing a code line number would also be extremely helpful.