<div>
  <p>フォントサイズ:30px</p>
  <p class="size16px">フォントサイズ:16px</p>
</div>
div{
  font-size:30px;
  font-family:sans-serif;
}
p.size16px{
  font-size:16px;
}

External CSS

  1. https://unpkg.com/ress/dist/ress.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.