<!DOCTYPE HTML> <html lang="en-US"> <head> <meta charset="UTF-8"> <title>字符制作三角边框</title> <style type="text/css"> *{margin:0;padding:0;} body{font-family:SimSun;} h1{text-align:center;} .demo1{width:300px;margin:20px auto;border:1px solid red;height:100px;} .demo1 em,.demo1 span{display:block;width:30px;height:16px;font-size:30px;overflow:hidden;_position:relative;margin-left:10px;} .demo1 em{margin-top:-16px;color:red;font-style:normal;} .demo1 span{margin-top:-14px;color:white;} .demo2{width:300px;border:1px solid #F00;height:100px;position:relative;margin-left:auto;margin-right:auto;} .demo2 em,.demo2 span{font-style:normal;font-size:30px;position:absolute;left:-16px;top:40px;color:red;} .demo2 span{left:-14px;color:white;} .case-arrow{ border:8px solid transparent; border-right: 8px solid #a4e3c3; position: absolute; left: 892px; top: 20px; } .case-arrow i{ border: 8px solid transparent; border-right: 8px solid #fff; position: absolute; left: -6px; top: -8px; z-index: 9; } </style> </head> <body> <h1>demo1 是用 margin 方法</h1> <div class="demo1"> <em>◆</em> <span>◆</span> </div> <h1>demo2 是用 position 方法</h1> <div class="demo2"> <em>◆</em> <span>◆</span> </div> <div class="case-arrow"> <i></i> </div> </body> </html>