body {
  font-family: Arial, sans-serif;
  background: #f2f2f2;
  padding: 20px;
}
.container {
  max-width: 600px;
  margin: auto;
  background: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h1 {
  text-align: center;
}
label {
  display: block;
  margin-top: 15px;
}
input, select, button {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
}
button {
  background-color: #4CAF50;
  color: white;
  border: none;
  margin-top: 20px;
  cursor: pointer;
}
button:hover {
  background-color: #45a049;
}
#total {
  font-weight: bold;
  margin-top: 15px;
  color: #333;
}