We currently have our 145x45 header logo set as the background of our mobile header, and have the rest of the header's 'background-color' matching the background of the logo.
The logo has a line a few pixels high across the top of the image, which under the current configuration doesn't extend beyond the image.
How can I make the rightmost 1px(w) x 45px(h) of the logo to fill (repeat-x?) the remainder of the header, so that the line at the top of the image extends across the entire header?