前端开发经常会遇到三角形的装饰，今天我们来用css实现。还是一样先上全代码，在逐步解析。
全代码展示
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<style>
.title {
position: relative;
padding-left: 16px;
}
.title::before {
content: "";
position: absolute;
border-width: 8px;
border-style: solid;
border-color: transparent transparent transparent red;
top: 50%;
left: 0;
margin-top: -8px;
}
</style>
<body>
<div class="title">css实现三角形</div>
</body>
</html>