.app__bgimg-image--1 {
    background: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/537051/city22222.jpg") center center no-repeat;
    background-size: cover;
  }
  .app__bgimg-image--2 {
    background: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/537051/forest.jpg") center center no-repeat;
    background-size: cover;
    opacity: 0;
    transition: opacity 0ms 1300ms;
    will-change: opacity;
  }