.byy-edge{ position: absolute; width: 0; height: 0; border-style: dashed; border-color: transparent; overflow: hidden; } .byy-edge.top{ border-top: 5px solid #555; } .byy-edge.bottom{ border-bottom: 5px solid #555; } .byy-edge.left{ border-left: 5px solid #555; } .byy-edge.right{ border-right: 5px solid #555; }