1, 2, 3 or 4 of an item. Perfect for payment selects

_forms.scss

/* 
	Selecting elements by amount of them
	------------------------------------	
*/

select {
	/* One Child*/
	&:nth-of-type(1):nth-last-child(1),
	&:only-child {
		width: 100%;
	}

	/* Two Children*/
	&:nth-of-type(1):nth-last-child(2),
	&:nth-of-type(2):nth-last-child(1){
		width: 49%;
	}

	/* Three Children */
	&:nth-of-type(1):nth-last-child(3), 
	&:nth-of-type(2):nth-last-child(2), 
	&:nth-of-type(3):nth-last-child(1) {
		width: 32.3333%;
	}
	/* Four Children */
	&:nth-of-type(1):nth-last-child(4), 
	&:nth-of-type(2):nth-last-child(3), 
	&:nth-of-type(3):nth-last-child(2), 
	&:nth-of-type(4):nth-last-child(1) {
		width: 24%;
	}
}