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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="none"> </head> <body> <div class="container"> <h1>Horizontal Centering</h1> <p>Center an element with the .mx-auto class:</p> <div class="mx-auto bg-warning" style="width:150px">Centered</div> </div> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>