<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>