W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style>
#container {
  width: 50%;
  aspect-ratio: 1;
  margin: auto;
  border: solid black 2px;
  overflow-x: scroll;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  writing-mode: vertical-rl;
  scroll-padding-top: 30px;
}
      
#container > div {
  margin: 2px;
  scroll-snap-align: start none;
}

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

.blue {
  background-color: lightblue;
  height: 80%;
  aspect-ratio: 1/2;
}
</style>
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<body>

<h3>CSS scroll-padding-top with altered snap position.</h3>
<p>Snap position must be placed on top of the child elements for scroll-padding-top to work. On pages written in English the snap position can normally be set on top of child elements by setting scroll-snap-align to "start none" because block direction is downwards. But, if we change block direction with the writing-mode property value set to "vertical-rl", the snap position changes from top to the right side of the child elements. With the code like this the scroll-padding-top property no longer works.</p>

<div id="container">
  <div class="blue">Blue</div>
  <div class="green">Green</div>
  <div class="blue">Blue</div>
  <div class="green">Green</div>
  <div class="blue">Blue</div>
  <div class="green">Green</div>
  <div class="blue">Blue</div>
  <div class="green">Green</div>
</div>

</body>
</html>