W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style> 
#container {
  width: 50%;
  aspect-ratio: 2/1;
  border: 1px solid black;
  display: grid;
  grid-template-columns: 1fr 1fr;
  justify-items: end;
  writing-mode: vertical-rl;
}

#container > div {
  border: 1px solid black;
}

.blue {
  background-color: lightblue;
  inline-size: 60%;
}

.red {
  background-color: coral;
  inline-size: 50%;
}

.green {
  background-color: lightgreen;
  inline-size: 70%;
}
</style>
</head>
<body>

<h2>justify-items with writing-mode: vertical-rl</h2>

<p>Grid items are aligned at the end of the grid container in the inline direction. Inline direction is moved from horizontal to downwards direction with the writing-mode property, so now the end of the contianer in the inline direction is at the bottom of the contianer instead of to the right of it.</p>

<div id="container">
  <div class="red">RED</div>
  <div class="blue">BLUE</div>
  <div class="green">GREEN</div>
  <div class="red">RED</div>
</div>

</body>
</html>