BookWright's Outline feature allows you to add an outline around your text and adjust the color and width of that outline. Outlining text can make it stand out better when there's not enough contrast with the background or image behind the text.
To use the outline feature first select the text you wish to outline. This will open the text styling window. Then, next to Outline, select the outline color and size as seen below.
In this example the top text is outlined while the bottom text is not. Notice how the outlined text stands out better against the darker parts of the background.
If you plan to order multiple copies of your book, or sell it to others, you should always first order and review a Blurb-printed copy to see how the text outlining--and all your other design choices--look in print.