CSS Stylesheet creation for popup

I have a Wordpress blog that has a plugin to create popups that can be used for just about anything. I just created a popup that has an image on the left and an opt-in form on the right. Yet when I test it, the form gets pushed down underneath the image causing major distortion. The plugin does allow for CSS style to adjust the dimensions of the popup window for situations like this one. I am sure it would be a quick fix for someone with CSS knowledge. I just don't have that. To see the distorted popup go to [login to view URL] I have attached a screenshot of the plugin backend where the CSS needs to be inserted.