css实现三角形箭头
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>triangle</title>
<style>
.triangle {
width: 0;
height: 0;
border: 10px solid;
border-color: transparent;
border-left-color: red;
}
</style>
</head>
<body>
<div class="triangle"></div>
</body>
</html>
实现效果：
