html, body {
    margin: 0;
    padding: 0;
  }
  
  
  .card {
    max-width: 400px;
    height: 200px;
    border: 1px solid rgba(255, 255, 255, .25);
    border-radius: 20px;
    background-color: rgba(255, 255, 255, 0.45);
    box-shadow: 0 0 10px 1px rgba(0, 0, 0, 0.25);
  }
  
  canvas {
    display: block;
  }
  
  td, th {
    text-align: center;
    border: solid black 2px;
  }