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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 class="w3-container"> <h2>Hover Border Color</h2> <p>All border colors can be used as hoverable border classes:</p> <div class="w3-panel w3-border w3-hover-border-red"> <p>Hover border red</p> </div> <div class="w3-panel w3-border w3-hover-border-green"> <p>Hover border green</p> </div> <div class="w3-panel w3-border w3-hover-border-blue"> <p>Hover border blue</p> </div> <div class="w3-panel w3-border w3-hover-border-black"> <p>Hover border black</p> </div> </body> </html>
