body {
  background-image: url('fondo.jpg');
  text-align: center;
}

/* Estilo del canvas */

canvas {
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.659), rgba(255, 255, 255, 0.428));
  border-style: solid;
  border-width: 3px;
  border-color: whitesmoke;
  border-radius: 6px;
}