<div class="center">
  <div class="box">
   <p>This box is centered.</p>
  </div>
</div>
.center {
  display: flex;
  justify-content: center;
  color: green;
}

.box {
  background-color: #f1f;
  padding: 1rem;
  width: 200px;
}

p {
  text-align: center;
}

External CSS

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External JavaScript

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