Hustle - how to stack elements?

Hello,
I use a Hustle OptIn FlyIn. In the options I have not selected an image, because I do not want to use one. I miss the functionality that I want to show the elements stacked upon each other. Currently the form looks like this: http://d.pr/i/Qs2J

I want to achieve that the text is aligned before the elements like this: http://d.pr/i/5l6I

What is the WPMUdev suggestion to achieve this?

Thanks!