<!DOCTYPE html>
<html>
<head>
<title>demo</title>
<meta charset="utf-8">
<style type="text/css">
.div1{
border-style: solid;
border-top-width: 0px;
border-right-width: 20px;
border-bottom-width: 50px;
border-left-width: 20px;
border-top-color: red;
border-right-color: white;
border-bottom-color: green;
border-left-color: white;
background: white;
width: 0px;
height: 0px;
}
.div2{
border-style: solid;
border-top-width: 0px;
border-right-width: 20px;
border-bottom-width: 50px;
border-left-width: 20px;
border-top-color: red;
border-right-color: white;
border-bottom-color: green;
border-left-color: white;
background: white;
width: 0px;
height: 0px;
}
.div3{
margin-top-width: 0px;
margin: 0 16px;
background: green;
width: 10px;
height: 50px;
}
</style>
</head>
<body>
<div class="div1"></div>
<div class="div2"></div>
<div class="div3"></div>
</body>
</html>
效果图：
