body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #0f172a;
  color: white;
  text-align: center;
}

header {
  padding: 40px;
}

textarea {
  width: 90%;
  max-width: 500px;
  height: 120px;
}

button {
  padding: 10px 20px;
  margin-top: 10px;
  cursor: pointer;
}