lib/resolver/css.js
function toRgba(color, opacity) {
		var r = parseInt(color.substr(0, 2), 16);
		var g = parseInt(color.substr(2, 2), 16);
		var b = parseInt(color.substr(4, 2), 16);

		return 'rgba(' + [r, g, b, opacity].join(', ') + ')';
	}
function toRgba(color, opacity) {
		var r = parseInt(color.substr(0, 2), 16);
		var g = parseInt(color.substr(2, 2), 16);
		var b = parseInt(color.substr(4, 2), 16);

		return 'rgba(' + [r, g, b, opacity].join(', ') + ')';
	}
function toRgba ( color , opacity ) { var r = parseInt ( color . substr ( 0 , 2 ) , 16 ) ; var g = parseInt ( color . substr ( 2 , 2 ) , 16 ) ; var b = parseInt ( color . substr ( 4 , 2 ) , 16 ) ; return 'rgba(' + [ r , g , b , opacity ] . join ( ', ' ) + ')' ; }
Transforms HEX color definition into RGBA one
@param  {String} color   HEX color, 6 characters
@param  {String} opacity Opacity value
@return {String}
Transforms HEX color definition into RGBA one