body {
  background: #0f0f0f;
  color: #00ff88;
  font-family: monospace;
  text-align: center;
  padding: 20px;
}

textarea {
  width: 95%;
  height: 400px;
  background: #000;
  color: #0f0;
  border: 1px solid #0f0;
  padding: 10px;
}

button {
  padding: 10px 20px;
  background: #00ff88;
  border: none;
  cursor: pointer;
  margin: 10px;
}