You can change the Letter Preview font color through Advanced Theming during your Advocate setup.

Once in your effort, click on the Settings & Design Tab followed by Advanced Theming as shown below.

In Advanced Theming, you can customize your form through CSS.  If you want to change the font color of your Preview Letter, do so by adding the snippet below to the last line of the CSS editor.

Add:
.cs-v2-form-textarea {
 color: red;
}

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