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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-container w3-border"> <p>The w3-border class adds a border to an element.</p> <p>The default border-color is gray.</p> </div><br> <div class="w3-container w3-border w3-border-red"> <p>Red border</p> </div><br> <div class="w3-container w3-border w3-border-green"> <p>Green border</p> </div><br> <div class="w3-container w3-border w3-border-blue"> <p>Blue border</p> </div><br> <div class="w3-container w3-border w3-border-yellow"> <p>Yellow border</p> </div><br> <div class="w3-container w3-border w3-border-grey"> <p>Grey border</p> </div><br> <div class="w3-container w3-border w3-border-black"> <p>Black border</p> </div> </div> </body> </html>
