I'm having trouble with getting the height of the leftmost (commented) nested table to automatically size in correspondence with the content on the right. It looks fine in Chrome, but in Word/Outlook it's not stretching.
Does anyone know how to get this working in Word/Outlook?
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title></title>
        <style>
                                                
            th, td {
                padding: 0;
            }
            
            table.border {
                border-collapse: collapse;
                border-spacing: 0;
            }
            
            .borderOutline {
                border: 4px solid #000000;
            }
                        
        </style>
    </head>
    <body>
    <table class="border" align="center" width="588" height="100%">
        <tbody>
            <tr valign="top">
                <td width="12">
                    
                    <!--PROBLEM TABLE START-->
                
                    <table class="border" width="100%" height="100%">
                        <tbody>
                            <tr bgcolor="red"><td> </td></tr>
                            <tr bgcolor="orange"><td> </td></tr>
                            <tr bgcolor="yellow"><td> </td></tr>
                            <tr bgcolor="green"><td> </td></tr>
                            <tr bgcolor="blue"><td> </td></tr>
                            <tr bgcolor="purple"><td> </td></tr>                           
                        </tbody>
                    </table>
                    
                    <!--PROBLEM TABLE END-->
                
                </td>
                
                <td width="576">
                
                    <table class="border" width="100%" height="100%">
                        <tbody>
                            <tr height="75">
                                <td class="borderOutline">
                                    
                                    <table cellspacing="20" cellpadding="20">
                                        <tbody>
                                            <tr>
                                            
                                                <td>HEADER</td>
                                            </tr>
                                        </tbody>
                                    </table>
                                
                                </td>
                            </tr>
                            
                            <tr>
                                <td class="borderOutline">
                                    
                                    <table cellspacing="20" cellpadding="20">
                                        <tbody>
                                            <tr>
                                            
                                                <td>
                                                    <p>BODY</p>
                                                    <p>will</p>
                                                    <p>contain</p>
                                                    <p>variable</p>
                                                    <p>amount</p>
                                                    <p>of</p>
                                                    <p>text</p>
                                                </td>
                                            
                                            </tr>
                                        </tbody>
                                    </table>
                                
                                </td>
                            </tr>
                            <tr height="75">
                                
                                <td class="borderOutline">
                                
                                    <table cellspacing="20" cellpadding="20">
                                        <tbody>
                                            <tr>
                                            
                                                <td>FOOTER</td>
                                            
                                            </tr>
                                        </tbody>
                                    </table>
                                
                                </td>
                                
                            </tr>
                        </tbody>
                    </table>
                
                </td>                   
                
            </tr>
        </tbody>
    </table>
    </body>
</html>