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. 

Slim Woman Wearing Too Big Jeans Weight Denim Slim Photo Background And Picture For Free Download - Pngtree

6,512 Too Big Stock Photos, High-Res Pictures, and Images - Getty Images

A Collision Between Gigantic Galaxy Clusters. Too Big, Too Early - Universe Today

150 Too Big Christmas Tree Stock Photos, High-Res Pictures, and

1,400+ Too Big Funny Stock Illustrations, Royalty-Free Vector

Take the attitude of a student. Never be too big to ask question. never know too much to learn something new Planning on Background of Working Table with Office Supplies. Business Concept

Too Big Fit Jeans Isolated Photo Background And Picture For Free Download - Pngtree

PDF looses background image if too big to fit on page · Issue #6790 · puppeteer/puppeteer · GitHub

5,200+ Too Big Jacket Stock Photos, Pictures & Royalty-Free Images