body {
  font-family: Arial, sans-serif;
  padding: 20px;
  background: #f0f0f0;
}
h1 {
  text-align: center;
}
section {
  margin-top: 20px;
}
.product {
  border: 1px solid #ccc;
  padding: 10px;
  margin-bottom: 10px;
  background: #fff;
}
.barcode-img {
  width: 200px;
}
button {
  margin: 5px;
  padding: 10px;
  background: #007bff;
  color: white;
  border: none;
  cursor: pointer;
  border-radius: 4px;
}
button:hover {
  background: #0056b3;
}
input {
  padding: 5px;
  margin: 5px;
}
#cash-buttons button {
  padding: 10px;
  background: #28a745;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
#cash-buttons button:hover {
  background: #218838;
}
.overlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: #0008;
  z-index: 1000;
  justify-content: center;
  align-items: center;
}
.modal {
  background: white;
  padding: 20px;
  border-radius: 8px;
  max-width: 400px;
  width: 90%;
}