.lazyloadDemo {
  img {
    width: 100%;
    background-color: #ddd;
  }
  > div {
    width: 100%;
    height: 220px;
    overflow: hidden;
    background-size: 100% 100%;
    background-color: #ddd;
  }
  img[lazy='loading'] {
    /*your style here*/
  }
  img[lazy='error'] {
    /*your style here*/
  }
  img[lazy='loaded'] {
    /*your style here*/
  }
}