html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #061a2d;
  font-family: Arial, sans-serif;
}

canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
}

.contenido {
  position: relative;
  z-index: 1;
  color: white;
  padding: 40px;
}