Change toast color XML fonts and background

Question

Your help and time are greatly appreciated!

I am trying t change the background to black and fonts to Red. the original is here https://www.imab.dk/windows-10-toast-notification-script/
<?xml version="1.0" encoding="UTF-8"?>

<ToastContent>

    <Visual>

        <Binding Template="ToastGeneric">

            <Text Placement="Attribution" Hint-Style="captionSubtle">

                <![CDATA[<font color="red">Please review the details below before contacting the Service Desk</font>]]>

            </Text>

            <Text>

                <![CDATA[<font color="red">---Windows 11 Upgrade---</font>]]>

            </Text>

            <Text>

                <![CDATA[

                <font color="red">---Windows 11 Upgrade---</font><br/>

                <font color="red">

                In order for your system to be automatically upgraded your system must remain powered on and connected to the MDA network (in the office or at home over VPN) overnight starting at 1800 MT.<br/><br/>

                DO NOT SHUT DOWN YOUR SYSTEM DURING THE UPGRADE PROCESS.<br/><br/>

                After hours please leave your system powered on, plugged into power, with the laptop lid open (or your system may go into hibernation).

                </font>

                ]]>

            </Text>

            <Text>

                <![CDATA[<font color="red">Snooze</font>]]>

            </Text>

        </Binding>

    </Visual>

</ToastContent>

Answer 1

I don't believe it is possible to set the colors using "html code" inside the xml.
Also i believe that the toast environment is using windows native colors, for toast notifications.
You might be able to change the background using a picture or go with adaptive cards instead.
Sorry my answer most likely, isn't what you wanted.