<div>
  <div class="parentElement">
    First paragraph.
    <div class="childElement">
      Second paragraph.
      <div class="childElement">
        Third paragraph.
        <div class="childElement">
          Fourth paragraph.
        </div>
      </div>
    </div>
  </div>
</div>
.parentElement {
  font-size: 15px;
}
.childElement {
  font-size: 2em;
}
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