console
<style>
div {
height: 100vh;
background: rgba(0, 0, 0, .7);
color: #fff;
line-height: 100vh;
text-align: center;
font-size: 20vh;
}
.a-img1 {
background-image: url(https://images.pexels.com/photos/1097491/pexels-photo-1097491.jpeg);
background-attachment: fixed;
background-size: cover;
background-position: center center;
}
.a-img2 {
background-image: url(https://images.pexels.com/photos/2437299/pexels-photo-2437299.jpeg);
background-attachment: fixed;
background-size: cover;
background-position: center center;
}
.a-img3 {
background-image: url(https://images.pexels.com/photos/1005417/pexels-photo-1005417.jpeg);
background-attachment: fixed;
background-size: cover;
background-position: center center;
}
</style>
<div class="a-text">1</div>
<div class="a-img1">
<span>2</span>
</div>
<div class="a-text">3</div>
<div class="a-img2">
<span>4</span>
</div>