css三角形实现代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.up{
width: 0px;
height: 10px;
border-bottom: 10px solid red;
border-left:10px solid transparent;
border-right: 10px solid transparent;
border-top:0;
}
.down{
width: 0px;
height: 10px;
border-top: 10px solid red;
border-left:10px solid transparent;
border-right: 10px solid transparent;
border-bottom:0;
}
.left{
height: 0;
width: 10px;
border-left:10px solid red;
border-bottom:10px solid transparent;
border-top:10px solid transparent;
border-right:0;
}
.right{
height: 0;
width: 10px;
border-right:10px solid red;
border-bottom:10px solid transparent;
border-top:10px solid transparent;
border-left:0;
}
</style>
</head>
<body>
<div class="down"></div>
<div class="left"></div>
<div class="right"></div>
<div class="up"></div>
</body>
</html>
