*{
	padding: 0;
	margin: 0
}
.main{
	background: #ccc;
	width: 400px;
	height: 200px;
	position: absolute;
	top:50%;
	margin-top: -100px;
	left: 50%;
	margin-left: -200px;
}
.left-top{
	background: #fc0;
	width: 50px;
	height: 50px;
	border-radius: 0 0 50px 0;
}
.right-bottom{
	position: relative;
	left: 350px;
	top: 100px;
	background: #fc0;
	width: 50px;
	height: 50px;
	border-radius:50px 0 0 0;
}