body {
    margin: 0;
    background: linear-gradient(to bottom, #1b263b, #0d1b2a);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }
  
  canvas {
    border: 2px solid #00ffcc;
    box-shadow: 0 0 15px rgba(0, 255, 204, 0.5);
  }