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<!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;
}

.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: end none;
  scroll-margin-inline-end: 20px;
  writing-mode: vertical-rl;
}
</style>
</head>
<body>

<h3>CSS scroll-margin-inline-end property.</h3>
<p>With the writing-mode property value set to vertical-rl, the end of the element in the inline direction is changed from right to bottom, and this also affects the scroll-margin-inline-end property.</p>
<p>In this example, snap position is set to end in block direction. To make a margin between child elements and container in this snap position, with writing-mode vertical-rl, the scroll-margin-inline-end property value is set to 20px.</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>

</body>
</html>