.desktop-warning {
      display: none;
      padding: 20px;
      text-align: center;
      font-size: 1.2em;
      color: white;
      background-color: #fff;
      color: #000;
  }

  .onlyMobileDevices {
    display: block;
  }

  #app
  {
    max-width: 880px;
    margin: 0 auto;
  }

  @media (min-width: 1025px) {
    .onlyMobileDevices {
      display: none;
    }
    .desktop-warning {
      display: block;
    }
  }