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< >

<!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>&#9670;</em>
<span>&#9670;</span>
</div>
<h1>demo2 是用 position 方法</h1>
<div class="demo2">
<em>&#9670;</em>
<span>&#9670;</span>
</div>

<div class="case-arrow">
<i></i>
</div>
</body>
</html>

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原文地址：https://www.cnblogs.com/Brittany-yan/p/5575421.html