Pixel to Em function for SASS

pxtoem-function.scss

$browser-context: 16;

@function em($pixels, $context: $browser-context) {
	@if (unitless($pixels)) {
		$pixels: $pixels * 1px;
	}

	@if (unitless($context)) {
		$context: $context * 1px;
	}

	@return $pixels / $context * 1em;
}

// Usage

.el{
	font-size: em(16);
	font-size: em(16px);
	
	padding: em(10px, 12px) em(20px, 12px);
}