icon utility class. uses sass to build out sizing modifiers.

icon.scss

.icon {
	display: inline-block;
	background-size: contain;

	font-size: 0;
	color: transparent;
}

.icon-block {
	display: block;
}

@each $i in (8 16 24 32 40 48 64 72 96 128) {
	.icon-#{$i} {
		width: #{$i}px;
		height: #{$i}px;
	}
}