.left-top-corner{border-left:2px solid #00fff7;left:0}.left-top-corner,.right-top-corner{width:18px;height:10px;border-top:2px solid #00fff7;position:absolute;top:0}.right-top-corner{border-right:2px solid #00fff7;right:0}.right-bottom-corner{border-right:2px solid #00fff7;right:0}.left-bottom-corner,.right-bottom-corner{width:18px;height:10px;border-bottom:2px solid #00fff7;position:absolute;bottom:0}.left-bottom-corner{border-left:2px solid #00fff7;left:0}.background-colors{background:rgba(0,0,0,.5)}