body {
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  background-color: #f4f4f4;
  color: #333;
}

h1 {
  color: #0056b3;
  margin-bottom: 20px;
}

div {
  margin-bottom: 10px;
}

label {
  margin-right: 10px;
  font-weight: bold;
}

input[type="number"] {
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 4px;
  width: 80px;
}

button {
  background-color: #007bff;
  color: white;
  padding: 10px 15px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  margin-top: 10px;
}

button:hover {
  background-color: #0056b3;
}

#result {
  margin-top: 20px;
  font-size: 2em;
  font-weight: bold;
  color: #28a745;
}