Embed image in a button element

Question

I'm attempting to use an HTML element to display a PNG image. It is impossible to see the entire image because the button is the same size as the image and the image is shown but not in the center for some reason. In other words, it appears like the top right corner of the image is situated in the button's center rather than in the button's top right corner.

The HTML code is as follows:

What truly occurs, in my opinion, is a margin issue. The background image is leaving the button since I receive a two-pixel margin. Since the button and the image are exactly 20 px in size, it is quite noticeable. I attempted padding:0 and margin:0