W3School TIY Editor
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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> body {margin:0;} .topnav { overflow: hidden; background-color: #f1f1f1; } .topnav a { float: left; display: block; color: black; text-align: center; padding: 14px 16px; text-decoration: none; font-size: 17px; border-bottom: 3px solid transparent; } .topnav a:hover { border-bottom: 3px solid red; } .topnav a.active { border-bottom: 3px solid red; } </style> </head> <body> <div class="topnav"> <a class="active" href="#home">Home</a> <a href="#news">News</a> <a href="#contact">Contact</a> </div> <div style="padding-left:16px"> <h2>底部带边框导航链接</h2> <p>请将鼠标悬停在链接上。</p> </div> </body> </html>