CodePen Embed - css-em

<div class="box">
  <span class="title1">title 1</span>
  <span class="title2">title 2</span>
</div>

.box{
  font-size: 20px;
}

.title1{
  font-size: 2em;
}

.title2{
  padding: 1em;
  border: 1px solid #ccc;
}

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