<html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>一个有趣的例子</title> <style> div { width: 250px; height: 400px; border: 1px solid #ccc; float: left; margin-left: -1px; position: relative; /* 脱标，但是占位置 ，相对定位比标准高一级*/ } div:hover { border: 1px solid red; z-index: 1; } </style> </head> <body> <div></div> <div></div> <div></div> <div></div> <div></div> </body> </html>
效果图如下：
