main{
	width: 880px;
	margin: auto;
}

article {
	margin: 5px;
	width:200px;
	height:200px;
	border:1px solid #12066C;
	float:left;
	background: #3F96E8;
	position: relative;
	overflow: hidden;
	border-radius: 10px;
}

article>div {
	position: absolute;
	background-color: #FFF;
	height: 20px;
	width: 20px;
	box-sizing:border-box;
	border:1px solid #555;
}

.clearfix{
	clear:both;
}