body {
  font-family: Arial, sans-serif;
}

#container {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

h1 {
  color: #333;
}

#equation {
  font-size: 24px;
  margin: 20px 0;
}

input[type="number"] {
  padding: 10px;
  margin-bottom: 10px;
}

button {
  padding: 10px 20px;
  margin: 5px;
  font-size: 16px;
  cursor: pointer;
}

#result {
  font-size: 18px;
  margin-top: 10px;
}

#score {
  font-size: 18px;
  margin-top: 20px;
}