<!DOCTYPE html>
<html>
<head>
    <style>

        .container {
            margin-left: 100px;
            margin-top: 100px;
        }

        .child {
            position: relative;
            width: 100px;
            height: 100px;
            background-color: black;
        }

    </style>
</head>
<body>
    <div class="container">
        <div class="child"></div>
    </div>
</body>
</html>