title: How to create border for png image
body: <p>I have a custom image in .png format. I want to create button. The form of button is this image. So I put the image inside button template and want it be fleshed only when mouse over the image. The shape of image is rectangle (<a href="http://prntscr.com/lz5m5q" rel="nofollow noreferrer">http://prntscr.com/lz5m5q</a>), but in fact it is custom shape. So how can I set border for button and ignore transparent background of image (I don't want see border as rectangle, border should be around my actual image). </p>