<!DOCTYPE html>
<html>
<head>
    <style>
    .container {
        border: 1px solid black;
        margin: 30px;
        padding: 50px;
        width: 300px;
        height: 300px;
        overflow: visible;
        box-shadow: black 0px 0px 20px;
        transform: translateZ(0px);
        box-sizing: border-box;
        overflow: hidden;
    }
    
    .child {
        width: 200px;
        height: 200px;
        background-color: green;
        transform: translateZ(0);
    }
    </style>
</head>
<body>
    <p>The green box should remain centered in the container</p>
    <div class="container">
        <div class="child">&nbsp;</div>
    </div>
</body>
</html>