.clb {
	width: 100px;
	position: absolute;
	left: 100px;
	top: 100px;
	color: red;
	border:1px solid blue;
}
.clb .clb-left,
.clb .clb-right {
	border-bottom: 5px solid;
	margin: 0 10%;
	width: 30%;
	height: 20px;  
	float: left;
}
.clb .clb-left:before,
.clb .clb-left:after,
.clb .clb-right:before,
.clb .clb-right:after {
	content: "";
	width: 10%;
	height: 50px;
	position: absolute;
	display: block;
}
.clb .clb-left:before {
  border-bottom: 5px solid;  
  border-bottom-left-radius: 20px;
  margin-left: -10%;
  margin-top: -30px;
}
.clb .clb-left:after {
  border-top: 5px solid;
  border-top-right-radius: 20px;
  margin-left: 30%;
  margin-top: 20px;    
}
.clb .clb-right:before {
  border-top: 5px solid;
  border-top-left-radius: 20px;
  margin-left: -10%;
  margin-top: 20px;
}
.clb .clb-right:after {
  border-bottom: 5px solid;
  border-bottom-right-radius: 20px;
  margin-left: 30%;
  margin-top: -30px;
}