<!DOCTYPE html>

<html>
<head>
    <style>
        .scroller {
            margin: 10px;
            width: 300px;
            height: 200px;
            overflow: hidden;
            border: 30px solid green;
            padding: 20px;
            line-height: 1.5em;
            border-top-right-radius: 150px 267px;
            border-bottom-left-radius: 150px 267px;
        }

        .contents {
            width: 100%;
            background-color: silver;
            height: 1000px;
        }

        .composited {
            transform: translateZ(0);
        }

        .scrollbar-hider {
            position: absolute;
            width: 17px;
            height: 240px;
            left: 372px;
            top: 40px;
            background-color: gray;
        }
    </style>
</head>
<body>
    <div class="scroller">
        <div class="composited contents">This is the scrolled contents</div>
    </div>
    <div class="scrollbar-hider"></div>
</body>
</html>