app/assets/stylesheets/components/_icons.scss
.icon, [class|="icon"] {
background: url('/assets/icons.png') no-repeat;
}
.icon-notify {
background-position: -117px -192px;
}
.icon-sync {
@include image-replacement;
background: url('/img/sync.gif') no-repeat;
display: inline-block;
height: 16px;
width: 16px;
}