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

div {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 20px;
  max-width: 400px;
  margin: auto;
}

h1,
h2 {
  color: #333;
}

label {
  display: block;
  margin-bottom: 10px;
  font-weight: bold;
}

p {
  margin-top: 15px;
  font-size: 16px;
  color: #555;
}

p.output{
  color: red;
}