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

	
.span_4_of_4 {
	width: 100%; 
}

.span_3_of_4 {
	width: 74.6%; 
}

.span_2_of_4 {
	width: 49.2%; 
}

.span_1_of_4 {
	width: 23.8%; 
}

/*  GO TO TWO COLUMNS LESS THAN 768 PIXELS */

@media only screen and (max-width: 768px) {
	.span_1_of_4 {
		width: 48.75%;
	}

	.span_1_of_4:nth-child(2n+1) {
		clear: both;
		margin-left: 0;
	}

}


/*  GO FULL WIDTH AT LESS THAN 480 PIXELS */

@media only screen and (max-width: 480px) {
	.span_4_of_4 {
		width: 100%; 
	}
	.span_3_of_4 {
		width: 100%; 
	}
	.span_2_of_4 {
		width: 100%; 
	}
	.span_1_of_4 {
		width: 100%; 
	}

}