body{
	background: #fff;
}
	.aa{
		width: 200px;
		height: 50px;
		margin: 20px auto;
		position: relative;
		border-radius: 3px;
		border: solid 1px #ccc;
	}
	.aa::before,.aa::after{
		width: 20px;
		height: 20px;
		position: absolute;
		top: 50%;
		margin-top: -10px;
		border-radius: 50%;
		content: ' ';
		border:solid 1px #ccc;
		border-top:solid 1px transparent;
		background: #fff;
	}
	.aa::after{
		border-right: solid 1px transparent;
		transform: rotate(45deg);
		right: -12px;
	}
	.aa::before{
		border-left: solid 1px transparent;
		transform: rotate(-45deg);
		left: -12px;
	}