to CSS Compiler
.box-shadow (@x: 0, @y: 0, @blur: 1px, @alpha: 1) {
	@val: @x @y @blur rgba(0, 0, 0, @alpha);
	-webkit-box-shadow: @val;
	-moz-box-shadow:    @val;
	box-shadow:         @val;
}
.box {
	@base: #f938ab;
	color:        saturate(@base, 5%);
	border-color: lighten(@base, 30%);
	div {
		.box-shadow(0, 0, 5px, 0.4);
	}
}
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Output (CSS) Length: 0