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computer_mall_django
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气泡框

<!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>
        .parent{
            width: 300px;
            height: 50px;
            background: #fff;
            border: 1px solid #000;
            position: relative;
        }
        .son{
            width: 200px;
            height: 30px;
            margin : 10px auto;
            background: black;
        }

        .single{
        position: absolute;
        top: 40px;
        left: 50px;
        width: 0;
        height: 0;
        border: 10px solid transparent;
        border-top-color: black ;
    }

    </style>
</head>
<body>
    <div class="parent">
        <div class="son"></div>
        <div class="single"></div>
    </div>
</body>
</html>