用css畫一個提示框


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .dialog{
            display:inline-block;
            padding:10px;
            border-radius: 4px;
            z-index: 2000;
            font-size: 12px;
            border:1px solid #303133;
            position: relative;
            top: 30px;
            left:50px;
        }
        .dialog .dialog_ico{
            position: relative;
            top: -31px;
        }

        .dialog_ico:after,.dialog_ico:before{
            content:'';
            display:block;
            position:absolute;
            border-style:solid;
            border-width:10px;
        }
        .dialog_ico:before{
            border-color:black transparent transparent  transparent;
            left:20px;
            top:42px;
        }
        .dialog_ico:after{
            border-color:#fff transparent transparent  transparent;
            left:20px;
            top:41px;
        }
    </style>
</head>
<body>
    <div class="dialog">
        <span class="dialog_text">這是提示框</span>
        <div class="dialog_ico"></div>
    </div>
</body>
</html>

 效果如下所示:


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