<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> .pg-header{ height: 48px; background-color: greenyellow; color: #dddddd; position: fixed; top:0; right: 0; left: 0; } .pg-body{ background-color: #dddddd; height: 5000px; margin-top: 50px; } </style> </head> <body> <div class="pg-header">头部</div> <div class="pg-body">内容</div> </body> </html>