body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f0f8ff;
  text-align: center;
}
header {
  background: #1976d2;
  color: white;
  padding: 15px;
}
nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}
main {
  padding: 20px;
}
textarea {
  width: 90%;
  max-width: 500px;
  height: 120px;
  font-size: 16px;
  margin-bottom: 10px;
}
button {
  padding: 10px 20px;
  font-size: 16px;
}
#output {
  margin-top: 20px;
  font-size: 24px;
  color: #333;
}
footer {
  background: #0d47a1;
  color: white;
  padding: 15px;
}
footer a {
  color: #fff;
  margin: 0 5px;
}