CodePen Embed - oNGYjxp

<div class="center">
  <p>Hello World!</p>
</div>

.center {
  height: 200px;
  position: relative;
  border: 3px solid green;
}

.center p {
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

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