.img-bg-div{
    position: relative;
}
.img-bg-div:after {
    content: '';
    width: 100%;
    height: 100%;
    position: absolute; 
    top: 0;
    left: 0;
    background: rgba(230,230,230);
    transition: opacity 0.5s ease;
  }
.img-bg-div.loaded:after {
    opacity: 0;
  }

.lazy-load{
    position: relative;
    width: 100%;
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
}
.lazy-load:after {
    content: '';
    width: 100%;
    height: 100%;
    position: absolute; 
    top: 0;
    left: 0;
    background: rgba(230,230,230);
    transition: opacity 0.5s ease;
  }
.lazy-load.loaded:after {
    opacity: 0;
  }