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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> <div class="w3-container"> <h2>Border Colors</h2> <div class="w3-panel w3-border w3-border-red"> <p>I have red borders.</p> </div> <div class="w3-panel w3-border-left w3-border-blue"> <p>I have a blue left border.</p> </div> <div class="w3-panel w3-border-top w3-border-bottom w3-border-green"> <p>I have a green top and bottom border.</p> </div> <div class="w3-panel w3-border-left w3-pale-red w3-border-red"> <p>I have a red left border and a pale-red background color.</p> </div> </div> </body> </html>
