<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
/* 盒模型总宽 = 200+ 200+200
transparent 取底色
*/
.box {
width: 0px;
height: 0px;
/* background-color: red; */
border-top:200px solid transparent;
border-left:200px solid transparent;
border-right:200px solid deeppink;
border-bottom:200px solid transparent;
}
</style>
</head>
<body>
<!-- 三角形 箭头 -->
<div class="box"></div>
</body>
</html>
