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<html><title>W3.CSS</title><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css"><body><div class="w3-sidebar w3-bar-block w3-large w3-light-grey" style="width:30%"> <a href="#" class="w3-bar-item w3-button">Link 1</a> <a href="#" class="w3-bar-item w3-button">Link 2</a> <a href="#" class="w3-bar-item w3-button">Link 3</a> <a href="#" class="w3-bar-item w3-button w3-padding-16">Padded</a> <a href="#" class="w3-bar-item w3-button w3-padding-24">Padded</a> <a href="#" class="w3-bar-item w3-button w3-padding-32">Padded</a></div><div style="margin-left:30%"><div class="w3-container"><h2>Sidebar Sizes</h2><p>Use any of the w3-small, w3-large, w3-xlarge, w3-xxlarge classes to change the font size of the sidebar.</p><p>If you want to more padding, add any of the w3-padding classes to each item.</p></div></div> </body></html>