<html>
    <table style="width:100%; background-color:red"><tr><td>
        <div style="width:150px; background-color:purple;">
            <table style="background-color:blue"><tr><td>

                <table style="width:100%; background-color:green; table-layout:fixed"><tr><td>
                    Content
                </td></tr></table>

            </td></tr></table>
        </div>
    </td></tr></table>
</html>