.scroll-fader {
    position: relative;
    width: 100%;
    /*height: 100vh;*/
    margin-bottom: 64px;
    overflow: hidden;
    padding-bottom: 66.66%;
    background: #eeeeee;
}

.scroll-fader img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    vertical-align: bottom;
}

.scroll-fader img:last-child {
    opacity: 0;
    transition: opacity ease .5s;
}

.scroll-fader img:last-child.visible {
  opacity: 1;
}