body {
  font-family: Montserrat, Arial, sans-serif;
  padding: 15px;
  background: #f6f6f6;
}

header h1 {
  text-align: center;
  margin-bottom: 20px;
}

.card {
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.total {
  font-size: 24px;
  font-weight: bold;
  color: #0077ff;
}

button {
  margin-top: 20px;
  width: 100%;
  padding: 15px;
  border: none;
  background: #0077ff;
  color: #fff;
  font-size: 18px;
  border-radius: 12px;
  cursor: pointer;
}

button:hover {
  background: #0055cc;
}