.checkout-popup{position:fixed;bottom:20px;right:20px;background:#333;color:#fff;padding:15px 20px;border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,.3);font-size:14px;opacity:0;transition:opacity .5s ease-in-out;max-width:260px;line-height:1.4}.checkout-popup.show{opacity:1}