<!DOCTYPE html>
<meta charset="utf-8">
<style>
div {
  width: 10ch;
  border: 2px solid blue;
  line-height: 1;
}
.ideo > div {
  width: 1em;
}
</style>
<body>
  <section>
    <div>12345<br>67890</div>
    <div>12345<br>67890</div>
    <div>12345<br>67890</div>
    <div>12345<br>67890</div>

    <div>12345<br>67890</div>
    <div>12345<br>67890</div>
  </section>

  <section class="ideo">
    <div>国<br>国</div>
    <div>国<br>国</div>
  </section>
</body>
