html {
	color: #000;
	background: #fff;
}
html,body,div {
	margin: 0;
	padding: 0;
}

html,body {
	width: 100%;
	height: 100%;
}

.bigBox {
	width: 400px;
	height: 200px;
	background-color: #CCC;
	margin-top: -100px;
	margin-left: 50%;
	top: 50%;
	left: -200px;
	position: relative;
	display: inline-block;
}

.leftTop {
	width: 50px;
	height: 50px;
	background-color: #FC0;
	border-radius: 0 0 50px 0;
	-webkit-border-radius: 0 0 50px 0;
	-moz-border-radius: 0 0 50px 0;
	-ms-border-radius: 0 0 50px 0;
	-o-border-radius: 0 0 50px 0;
	left: 0;
	top: 0;
}

.rightBottom {
	width: 50px;
	height: 50px;
	background-color: #FC0;
	border-radius: 50px 0 0 0;
	-webkit-border-radius: 50px 0 0 0;
	-moz-border-radius: 50px 0 0 0;
	-ms-border-radius: 50px 0 0 0;
	-o-border-radius: 50px 0 0 0;
	position: absolute;
	right: 0;
	bottom: 0;
}