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<!DOCTYPE html> <html> <title>W3.CSS</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://www.w3schools.com/w3css/5/w3.css"> <body class="w3-container"> <h2>The w3-flex Class</h2> <p>For perfect centering use <b>justify-content:center</b> and <b>align-items:center</b>.</p> <div class="w3-flex w3-light-grey" style="height:150px;justify-content:center;align-items:center"> <div class="w3-container w3-blue"><h3>Centered</h3></div> </div> </body> </html>
