.square, .circle{

	width:100px;

	height:100px;

}

.circle{

	border-radius:50%;

}

#blockBlue{

	background-color:blue;

	position:relative;

}

#blockPink{

	background-color:pink;

	position:absolute;

}
#container{

	background-color:red;

	margin:0 auto;

	width:400px;
	
}