.size{
	width:200px;
	height:50px;
}

.parent1{
	margin:10px;
	padding:10px;
	background-color:#eee;
	border:1px solid #ccc;

	&>.child1{
		padding:10px;
		background-color:#080;

		&::before{
			color:yellow;
			content:"TEST MESSAGE";
			font-style:italic;
			font-weight:bold;
		}
	}

	&.additional{
		background-color:red;
	}
}