W3Schools Tryit Editor

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

.blue {
  background-color: lightblue;
  height: 95%;
  aspect-ratio: 3/2;
}

.green {
  background-color: lightgreen;
  height: 80%;
  aspect-ratio: 4/3;
}

.blue, .green {
  display: inline-block;
  margin: 2px;
  scroll-snap-align: none start;
}
</style>
</head>
<body>

<h1>Change scroll-padding-inline-start property with JavaScript</h1>

<p>Try first to scroll to see how the scroll snaps on start of elements in the inline direction.</p>

<p>Now, click button, click inside the container, and see how scrolling behaviour has changed. The elements still snap on start of element like before, but now with a 20px distance in the inline direction from the start of the container to the child elements.</p>

</body>
</html>