body { margin:0; font-family: sans-serif; }
.pos-container { display:flex; height:100vh; }
header { background:#333; color:#fff; padding:10px; text-align:center; }
.scan-area { flex:0 0 300px; padding:20px; background:#f4f4f4; }
.scan-area input, .scan-area button { width:100%; margin-bottom:10px; padding:10px; font-size:1rem; }
.cart-area { flex:1; padding:20px; }
#cartTable { width:100%; border-collapse: collapse; }
#cartTable th, #cartTable td { border:1px solid #ccc; padding:8px; text-align:center; }
#checkoutBtn { margin-top:10px; padding:10px 20px; font-size:1.1rem; }