Email Stacks - Image alignment

I have a email stack with an image at the top. The wrapper is set to “center”, the email width in styles is 600px, and the image is 600px wide. I set the alignment property on the image to centered & it looks that way in the editor but on preview (internal or external) it is left aligned and shrunk by 20px on the right. It does this regardless of the alignment property of the image block.

Any suggestions?


Thank you. That does fix the alignment but our email banner pictures should be edge-to-edge. Thats why a 600px picture for a 600px email. With the column you get 20px of space on left & right. Had hoped that leaving it outside any wrapping would allow it to be full size. Any thoughts?