body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
  }
  canvas {
    border: 2px solid #000;
    background-color: #ffffff;
  }
  #mensaje {
    margin-top: 10px;
    font-size: 18px;
  }