W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style>
#container {
  width: 80%;
  aspect-ratio: 2/1;
  margin: auto;
  border: solid black 2px;
  overflow-x: hidden;
  overflow-y: scroll;
  scroll-snap-type: y mandatory;
  scroll-padding-top: 0;
}

.blue {
  background-color: lightblue;
  width: 95%;
  aspect-ratio: 3/1;
}

.green {
  background-color: lightgreen;
  width: 80%;
  aspect-ratio: 4/1;
}

.blue, .green {
  margin: 2px;
  scroll-snap-align: start;
}
</style>
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<body>

<h1>Change scroll-padding-top property with JavaScript</h1>

<p>Try first to scroll to see how the scroll snaps on start of elements on y-axis.</p>

<p>Now, click button, click inside the container, and see how scrolling behavior has changed. The elements now snap on start of elements with a 20px distance from the container.</p>

</body>
</html>