<div class="one">
  <h1 class="two">안녕하세요</h1>
  <h1 class="two ib">안녕하세요</h1>
</div>
.one{
  text-align:center;
  background-color: bisque;
  height:500px;
}

.two{
  text-align:center;
  background-color: aqua;
}


.ib{
  display:inline-block;
}

External CSS

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External JavaScript

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