File: etc/advanced_syntax_1.css

$red = #ff0000;
$green = #0000FF;
$border = $heavy-$light solid $green;
$heavy = 4em;
$light = 0.5em;

body{
	background-color: $red; ## Line comment
	color: $red-$green;
	border: $border;
	bla: $heavy/2;
}
div#Navigation {
	width: $heavy*12;
	font-size: 12px;
}