body {
  font-family: Arial, sans-serif;
  background-color: #f2f2f2;
}

#container {
  max-width: 500px;
  margin: 0 auto;
  text-align: center;
  background-color: #fff;
  padding: 20px;
  box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
  border-radius: 5px;
}

h1 {
  font-size: 36px;
  margin-bottom: 20px;
}

.form-row {
  margin: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

label {
  font-size: 24px;
}

input[type="number"] {
  width: 50px;
  font-size: 24px;
  text-align: center;
}

button {
  margin: 20px auto;
  font-size: 20px;
  padding: 10px 20px;
  border: none;
  background-color: #0066cc;
  color: #fff;
  cursor: pointer;
  border-radius: 5px;
  box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
}

#result {
  text-align: center;
  font-size: 24px;
  margin-top: 50px;
}