<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Position用法</title> <style> .div5{ position: fixed; /*固定标签*/ bottom: 25px; right: 25px; } .div1{ background-color:purple; height: 500px; width: revert; } .div2{ background-color: red; height: 500px; width: revert; } </style> </head> <body> <div id="top"></div> <div class="div2">div1</div> <div class="div1">div2</div> <a class="div5" href="#top">返回上一层</a> </body> </html>
原文：https://www.cnblogs.com/TKOPython/p/12727869.html