@mixin left-top {
	position: absolute;
	top: 0;
	left: 0;
	@content;
}

.container {
	width: 100px;
	height: 100px;
	@include left-top;
}

.box {
	width: 200px;
	height: 200px;
	@include left-top {
	// 여기부터 content 내용에 들어간다.
		bottom: 0;
		right: 0;
		margin: auto;
	}
}