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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="/lib/w3.css"> <body> <div class="w3-container w3-leftbar w3-pale-blue w3-border-blue"> <h2>Leftbar</h2> <p>The w3-leftbar class adds a thick left border (bar) to an element.</p> </div> </body> </html>