/*  GRID OF FOUR   ============================================================================= */

	
.span_4_of_4 {
	width: 100%; 
}

.span_3_of_4 {
	width: 73.6%; 
}

.span_2_of_4 {
	width: 49.2%; 
}

.span_1_of_4 {
	width: 22.8%; 
}


/*  GO FULL WIDTH AT LESS THAN 900 PIXELS */

@media only screen and (max-width: 900px) {
	.span_4_of_4 {margin: 1% 1%;
		width: 100%; 
	}
	.span_3_of_4 {margin: 1% 1%;
		width: 100%; 
	}
	.span_2_of_4 {margin: 1% 1%;
		width: 100%; 
	}
	.span_1_of_4 {margin: 1% 1%;
		width: 100%; 
	}
}