SOURCE

<div id="main">
	<div id="left">
		<div id="inner">
			<div id="center"></div>
		</div>
	</div>
	<div id="right"></div>
</div>

body{
		background-color: #ccc;	
	}
	#main{
		background-color: #f57923;
		width: 480px;
		height: 420px;
		margin:150px auto;
		border-radius: 130px;
	}
	#left,#right{
		background-color: #fff;
		margin-top:90px;
		height: 220px;
	}
	#left{
		float: left;
		width: 250px;
		margin-left: 65px;
		border-top-right-radius: 65px;
		z-index: -99999;
 
	}
	#inner{
		background-color: #f57923;
		width: 140px;
		height: 170px;
		margin-left: 55px;
		margin-top: 50px;
		border-top-right-radius: 40px;
		z-index: 10px;
 
	}
	#center{
		background-color: #fff;
		position: relative;
		width: 50px;
		height: 125px;
		top:45px;
		left: 45px;
		z-index:999999; }
	#right{
	float: right;
	width: 50px;
	margin-right:65px;}