body {
  font-family: Arial, sans-serif;
  text-align: center;
  margin-top: 50px;
}

input {
  width: 200px;
  height: 30px;
  font-size: 16px;
}

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

#output {
  font-size: 24px;
  margin-top: 20px;
}