border画梯形

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>CSS使用border制作梯形</title>
<style>
   .tixing{
       200px;
       border-bottom:200px solid red;
       border-left:50px solid transparent;/*transparent透明色*/
       border-right:50px solid transparent;
   }
</style>
</head>
<body>
<div class='tixing'>
</div>
</body>
</html>