body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #f5f5f5;
}

.container {
  text-align: center;
  background: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  width: 90%;
  max-width: 400px;
}

.hidden {
  display: none;
}

button {
  background: #007bff;
  color: white;
  padding: 10px 15px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  margin: 5px;
}

button:hover {
  background: #0056b3;
}

#discount-code {
  font-weight: bold;
  color: green;
}