Originally when I CSSed the round avatars on the DesignSwap comments area, I used the -webkit-mask-image property. I was really proud of how neat and effective this was until I realized you could apply border-radius to an image directly. To achieve a round avatar with a 2px beige border, I applied the following CSS to an avatar loading within a div class called avatar-frame…
Direct link: CSS3 Border-Radius & Rounded Avatars