css3箭头

<!DOCTYPE html>
<html lang="en" class="muui-theme-webapp-main">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport"
          content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no,initial-scale=1">
    <meta name="format-detection" content="telephone=no">
    <meta name="apple-mobile-web-app-status-bar-style" content="white">
    <meta name="apple-mobile-web-app-capable" content="no">
    <title>Css arrow</title>
</head>
<style type="text/css">
    #triangle-facing-right {
        display: inline-block;
        margin: 72px;
        border-right: 24px solid; border-bottom: 24px solid;
        width: 120px; height: 120px;
        transform: rotate(-45deg);
    }
    #triangle-facing-left {
        display: inline-block;
        margin: 72px;
        border-left: 24px solid; border-bottom: 24px solid;
        width: 120px; height: 120px;
        transform: rotate(45deg);
    }
</style>
<body>
<div id="triangle-facing-right"></div>
<div id="triangle-facing-left"></div>
</body>
</html>
效果图：
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