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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://www.w3schools.com/w3css/4/w3.css"> <body> <div class="w3-container"> <h2>Hoverable Borders</h2> <div class="w3-panel w3-border w3-hover-border-red"> <p>Border that turns red on hover.</p> </div> <div class="w3-panel w3-border w3-border-red w3-hover-border-green"> <p>Red border that turns green on hover.</p> </div> </div> </body> </html>
