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<!DOCTYPE html>
<html>
<head>
<style>
.center {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
  border: 3px solid green; 
}
</style>
</head>
<body>
<h1>Centering</h1>
<p>A container with both the justify-content and the align-items properties set to <em>center</em> will align the item(s) in the center (in both axis).</p>
<div class="center">
  <p>I am vertically and horizontally centered.</p>
</div>
</body>
</html>