body {
  font-family: Arial, sans-serif;
  background-color: #eef2f3;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: white;
  padding: 30px;
  border-radius: 10px;
  width: 400px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

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

.input-group {
  margin-bottom: 15px;
}

label {
  display: block;
  margin-top: 5px;
}

input[type="number"] {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
  box-sizing: border-box;
}

button {
  width: 100%;
  padding: 10px;
  background-color: #007bff;
  border: none;
  color: white;
  font-size: 16px;
  margin-top: 15px;
  cursor: pointer;
  border-radius: 5px;
}

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

#result {
  margin-top: 20px;
  font-size: 18px;
  text-align: center;
}