framework/less/lib/Avatar.less

.Avatar {
  display: inline-block;
  box-sizing: content-box;
  color: #fff;
  text-align: center;
  vertical-align: top;
  background-color: @control-bg;
  font-weight: normal;
  .Avatar--size(48px);

  img {
    display: inline-block;
    width: 100%;
    height: 100%;
    border-radius: 100%;
    vertical-align: top;
    // Prevent blurriness in Chrome
    image-rendering: -webkit-optimize-contrast;
  }
}

.Avatar--size(@size) {
  width: @size;
  height: @size;
  border-radius: @size;
  font-size: @size / 2;
  line-height: @size;
}