.corner-ribbon{width:350px;background:#e43;line-height:50px;letter-spacing:3px;color:#f0f0f0;box-shadow:0 0 3px rgba(0,0,0,.3);z-index:1000;transform:rotate(45deg);-webkit-transform:rotate(45deg);position:absolute;top:75px;right:-75px}.lenta{padding:18px;width:350px;text-align:center;color:#fff}.sert{width:200px;border:4px double #000}