$os-icons: 'icons/os-icons.png'; // TODO: Make these use a 16-base instead of 15. %os-icons { background: image-url($os-icons) 0 0 no-repeat; background-size: auto sl-px-to-rem(15px); display: inline-block; width: sl-px-to-rem(15px); height: sl-px-to-rem(15px); } .mac-icon { @extend %os-icons; background-position: -(sl-px-to-rem(35px)) 0; } .windows-icon { @extend %os-icons; } .linux-icon { @extend %os-icons; background-position: -(sl-px-to-rem(65px)) 0; } .paid-icon { @extend %os-icons; background-position: -(sl-px-to-rem(100px)) 0; }