<html>
<head>
    <style>
        div {
            border-width: 21px 30px 30px 21px;
            width: 75px;
            height: 75px;
            margin: 10px;
            -webkit-border-image: -webkit-gradient(linear, left top, left bottom, from(#00abeb), to(#fff), color-stop(0.5, #fff), color-stop(0.5, #66cc00)) 21 30 30 21 repeat repeat;
            border-style: solid;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>