CodePen Embed - ExewvEa

<div class="post">
  Lorem ipsum dolor sit amet consectetur adipisicing elit.
  <div class="post">
    Lorem ipsum dolor sit amet consectetur adipisicing elit.
  </div>
</div>

.post {
  container-type: inline-size;
}

@container (min-width: 480px) {
  .post {
    border: 4px solid #000;
    padding: 1em;
  }
}

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