.box1,
.box2,
.box3{
	display:inline-block;
	border:3px solid black;
}
.box1{
	background:red;
	width:100px;
	height:100px;
}
.box2{
	background:blue;
	width:80px;
	height:80px;
}
.box3{
	background:green;
	width:60px;
	height:60px;
}
.box1:hover{
	background:yellow;
}
.box2:hover{
	background:orange;
}
.box3:hover{
	background:lightblue;
}