.container{width:100%;height:300px;background:linear-gradient(135deg,#e8008e,#220b76);position:relative;overflow:hidden}.wave{position:absolute;bottom:0;left:0;width:100%;height:100px;background-color:#000;border-radius:0 0 50% 50%/0 0 100% 100%}.center-contain{margin:20px 0;padding:30px 50px;text-align:center;background:rgba(0,0,0,.05);border-radius:4px}