evolution question

I've got an evolution question: When you compose an email in evolution you have the option to go to the top and select Format -> Page you can select a different page background color.

But you have to do this for every single message you create if you want to change the background color for the messages you compose.

How do I made this the default for all the emails I compose with Evolution? I know how to do it with Thunderbird... but not Evolution...