<div class="container">
  <img src="http://placehold.it/198/">
</div>
.container {
  display: flex;
  width: 300px;
  height: 300px;
  border: 1px solid #333;
  align-items: center;
  justify-content: center;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.