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<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><div class="w3-container"> <h2>Hiding Panels</h2> <p>Hiding a panel can be done using an onclick event on a w3-button:</p></div><div class="w3-panel w3-red w3-display-container"> <span onclick="this.parentElement.style.display='none'" class="w3-button w3-red w3-large 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>