.edges:before,.edges:after{content:"";background:linear-gradient(-45deg,#0000 6px,#fff 6px) 0 0/12px 12px,linear-gradient(45deg,#0000 6px,#fff 6px) 0 0/12px 12px;height:12px;position:absolute;left:0;right:0}.edges:before{top:-11px;transform:scaleY(-1)}.edges:after{bottom:-11px}