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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script src="http://code.jquery.com/jquery-1.11.3.min.js"></script>
    <style>
        #msg_container {
            position: fixed;
            background-color: #000000;
            opacity: 0.6;
            left: 0;
            top: 0;
            right: 0;
            bottom: 0;
        }
​
        #modalDialog {
            display: inline-block;
            background-color: white;
            position: absolute;
            border: 1px solid rgb(103, 103, 103);
            box-shadow: 0 4px 17px 0px rgba(0,0,0,0.4);
            top: 50%;
            left: 50%;
        }
​
        body {
            background-color: blue;
        }
    </style>
</head>
<body>
    <div id="msg_container">
        <div id="modalDialog"></div>
    </div>
    <script>
        $(function() {
            setContent("hello world\nabcd\ne\nf\ngkaljflkdajkfljsdkjfklajsdlkfjalksd");
​
            function setContent(str) {
                var $dialog = $("#modalDialog"), w, h;
                var contentArray = str.split("\n"),
                    newArray = contentArray.map(function(ele, idx) {
                    return ele + "<br>";    // change '\n' in str to <br>
                });
                $dialog.html("<p>" + newArray.join("") + "</p>");
​
                w = $dialog.width();        // dynamically calculate the width
                h = $dialog.height();       // and height
                $dialog.css({                                   
                    marginLeft: -1 * w / 2 + "px",   // center the dialog horizontally
                    marginTop : -1 * h / 2 + "px"    // center the dialog vertically
                });
            }
        });
    </script>
</body>
</html>
 
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