app/assets/stylesheets/popolo/main.css.scss
// http://monkeyraptor.johanpaul.net/2013/06/circle-clipping-photo-using-css.html
.popolo-circle {
overflow: hidden;
width: 100px;
height: 100px;
-webkit-border-radius: 50%;
border-radius: 50%;
background-repeat: no-repeat;
// Eliminate any 1px border on the image.
background-size: 102px auto;
// Faces tend to be low in the image.
background-position: -1px -15px;
}