Background Image Alignment Suggestion

Can you implement a function for background image alignment? Right now you only have tiled or not-tiled, and the not-tiled aligns the background to the left side of the page.

I designed a background that looks great behind the content, but as the page stretches the content moves because it's centered, and then looks very bad. I have to resize my browser to see it the way I want.
 
sad I’m slightly irked
Inappropriate?
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