You can add this to your inline code –
background: rgba(0, 0, 0, 0.73);
That will add a see though/transparent black background behind the text. Here is what it will look like – http://i.imgur.com/6NkUrNn.png
There are ways to make it show evenly in the center of the widget vertically and horizontal if you’re interested in doing that. If so, let me know!