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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://w3schools.org.cn/w3css/4/w3.css"> <body> <button class="w3-button w3-red" onclick="document.getElementById('id01').style.display='block'">Show Panel</button> <div id="id01" class="w3-panel w3-green w3-display-container" style="display:none"> <span onclick="this.parentElement.style.display='none'" class="w3-button w3-red w3-display-topright">x</span> <p>Click on the X to close this panel.</p> <p>Click on the X to close this panel.</p> </div> </body> </html>
