@mixin clearfix {
    *zoom:1;
    
    &:after {
		content : " ";
		clear   : both;
		display : block; 
		overflow: hidden; 
		height  : 0; 
    }
}

@mixin size($width, $height:$width){
	width : $width;
	height: $height;
}

@mixin cover(){
	position:absolute;
	left    :0;
	right   :0;
	top     :0;
	bottom  :0;
}

@mixin auto_center($width, $height:$width){
	@include cover();
	margin: auto;
}


// Converting PX value to EM based on browser-context variable
// Usage: @include em(16)
$browser-context: 16; // Default

@mixin em($pixels, $context: $browser-context) {
	font-size: #{$pixels}px;
	font-size: #{$pixels/$context}em;
}