Change the content

Go into Admin CP and search for "messagetext".

There is a style property called @messageText which will allow you to choose the font size and the colour of the text.
 
That's not the right thing...

Go to Admin CP.

In the top right corner is a search box.

Type in there messageText.

One of the results will be a Style Property.

Choose that, and your options will be there.
 
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