Sticky sections
HTML
<div class="sticky-sections">
<section class="sticky-sections__section">...</section>
<!-- Repeat other sections -->
...
</div>
CSS
.sticky-sections {
height: 100%;
overflow: scroll;
}
.sticky-sections__section {
/* Take full size */
height: 100%;
width: 100%;
/* Stick to the top */
position: sticky;
top: 0;
}
Demo