body {
  font-family: sans-serif;
  background: #f7f7f7;
  padding: 20px;
}

.container {
  max-width: 700px;
  margin: 0 auto;
}

h1 {
  font-size: 22px;
  color: #333;
  margin-bottom: 15px;
}

textarea {
  width: 100%;
  height: 120px;
  padding: 10px;
  font-family: monospace;
  font-size: 14px;
  margin-bottom: 10px;
}

button {
  background: #007acc;
  color: #fff;
  padding: 10px 15px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
}

button:hover {
  background: #005fa3;
}

#output {
  width: 100%;
  height: 120px;
  padding: 10px;
  font-family: monospace;
  font-size: 14px;
  margin-top: 10px;
}