message: fix the background
diff: .btn-action {
  - width: 24px;
  - height: 24px;
  - background-color: #656565;
  + color: #656565;
  margin: 5px 8px;
  outline: 0;
  mask-repeat: no-repeat;
  + border-style: none;
  + font-size: 24px;
  + background-color: transparent;
  }
  .btn-action:hover {
  - background-color: #333333;
  + color: #333333;
  }
  .btn-action:active {
  - background-color: #656565;
  + color: #656565;
  }
  