Background too big

The background on the email template is showing as really thick on some emails. How can I make this as thin as possible? I have the boarder size set to zero and the email width set to 700px already. I would like it to be around 2 or 3 times thicker that the white boarder around the picture. 

iframe video, background too big on small video. · Issue #909 · dimsemenov/Magnific-Popup · GitHub

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