.color-div{
	margin:10px;
	display:inline-block;
	width:100px;
	height:100px;
}
.red-div{
	background:red;
}
.green-div{
	background:green;
}
.blue-div{
	background:blue;
}
.pic-div{
	background:url(../img/test.jpg);
	background-size:cover;
}