pe-calc mixin

pe-calc.scss

@mixin pe-calc($property, $formula, $fallback) {
	#{$property}: $fallback;
	#{$property}: calc(#{$formula});
}



// usage
@include pe-calc(width, '100% - 100px - 18px', 70%);

// generates
width: 70%;
width: calc(100% - 100px - 18px);