body {
  background-color: #000;
  color: #00ff00;
  font-family: 'Courier New', Courier, monospace;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.terminal {
  border: 2px solid #00ff00;
  padding: 2em;
  border-radius: 8px;
  width: 300px;
  background-color: rgba(0, 0, 0, 0.8);
  text-align: center;
}

input {
  background-color: #000;
  color: #00ff00;
  border: 1px solid #00ff00;
  padding: 0.5em;
  margin: 0.5em 0;
  width: 90%;
}

button {
  background-color: #000;
  color: #00ff00;
  border: 1px solid #00ff00;
  padding: 0.5em 1em;
  cursor: pointer;
}

.error {
  margin-top: 1em;
  color: red;
  font-size: 0.9em;
}