#demo-canvas {
  height: 200px;
  margin-top: 20px;
  visibility: hidden;
}

#demo-canvas.affix {
  top: 300px;
  visibility: visible;
}

@media (max-width: 767px) {
  #demo-canvas {
    display: none;
  }
  .demo-button {
    display: none;
  }
}