Breakpoint mixin in scss

gistfile1.txt

@mixin breakpointt ($size : 'sm') {
	$all : (sm : "320px",
			md :"768px",
			lg : "1200px",
		);

	@if (map-has-key($all, $size )) {
		$size : map-get($all, $size );

		@media screen and (min-width: $size ) {
			@content;
		}
	}



}