body {
  font-family: 'Segoe UI', sans-serif;
  background: #f4fff4;
  padding: 20px;
}

h1 {
  color: #2e8b57;
}

form {
  margin-bottom: 20px;
}

input {
  padding: 10px;
  width: 300px;
  font-size: 1em;
}

button {
  padding: 10px;
  font-size: 1em;
}

#output {
  background: #fff;
  border: 1px solid #ccc;
  padding: 15px;
  max-width: 600px;
}