Xem ví dụ

<!DOCTYPE html>
<html>
<head>
    <title>Xem ví dụ</title>
    <style type="text/css">
        div{
           width:300px;
           height:100px;
           border:20px solid transparent;
           border-image-source:url(../image/pattern4.png);
           border-image-slice:50 50 50 50;
        }
    </style>
</head>
<body>
    <div>
        <h1>Lập Trình Web</h1>
    </div>
</body>
</html>
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