用纯CSS创建一个三角形的原理是什么?

首先,需要把元素的宽度、高度设为0。然后设置边框样式

<!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>
    .box {
      width: 0;
      height: 0;
      border-top: 40px solid transparent;
      border-left: 40px solid transparent;
      border-right: 40px solid transparent;
      border-bottom: 40px solid #ff0000;
    }
  </style>
</head>

<body>
  <div class="box"></div>

</body>

</html>

 

posted @ 2019-07-24 15:00  SRH啦  阅读(1480)  评论(0编辑  收藏  举报