css 画箭头

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <style>
        *
        {
            margin: 0px;
            padding: 0px;
        }

        #show
        {
            margin: 10px auto;
            position: absolute;
            top: 50px;
            left: 50px;
            text-align: center;
        }

        #some
        {
            width: 200px;
            margin-left: 100px;
            text-align: center;
            position: absolute;
            background-color: rgba(255, 0, 0,0.6);
            border-radius: 5px;
        }

        #info
        {
            width: 400px;
            height: 300px;
            position: absolute;
        }

        #outarrow
        {
            border-color: transparent transparent #efefef;
            border-style: solid;
            border-width: 16px;
            height: 0;
            width: 0;
            position: absolute;
            top: 0px;
            left: 184px;
        }

        #innerarrow
        {
            border-color: transparent transparent white;
            border-style: solid;
            border-width: 16px;
            height: 0;
            width: 0;
            position: absolute;
            top: 0px;
            left: 184px;
            margin-top: 6px;
        }

        #content
        {
            border: 4px solid;
            border-radius: 4px;
            border-color: #efefef;
            width: 400px;
            margin: 32px auto 0px;
            -moz-box-sizing: border-box;
            -webkit-box-sizing: border-box;
            box-sizing: border-box;
        }

            #content p
            {
                text-align: left;
                text-indent: 20px;
            }
    </style>

</head>
<body>
    <div id="show">
        <div id="some">下面就是箭头效果</div>
        <div id="info">
            <div id="outarrow"></div>
            <div id="innerarrow"></div>
            <div id="content">
                <h1>使用边界产生箭头</h1>
                <p>要点1：设置盒子的宽高均为0，只设置边界宽度</p>
                <p>要点2：可以通过border-style改变效果</p>
            </div>
        </div>
    </div>
</body>
</html>
显示效果：
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