.box {
	width:180px;
	height:160px;
	margin:100px auto;
	animation:size 1s infinite;
	animation-direction:alternate;
	transition:1s all;
}
.round1 {
	width:100px;
	height:100px;
	border-radius:50%;
	background-color:hotpink;
	left:0;
	top:0;
	position:absolute;
}
.round2 {
	width:100px;
	height:100px;
	border-radius:50%;
	background-color:hotpink;
	position:absolute;
	right:0;
	top:0;
}
.bottom {
	width:100px;
	height:100px;
	background-color:hotpink;
	position:absolute;
	top:40px;
	left:40px;
	transform:rotate(45deg);
}
@keyframes size {
	0% {
	transform:scale(0.6);
}
100% {
	transform:scale(1);
}
}