Change style of PayPal Pro Forms

I am using S2Member Pro to sell streaming videos.

When I insert a PayPal Pro form shortcode on a page, it is rendered without any styling. How can I change the style?

example

Hi Addison.

Pro-forms are styled and blend with the theme you’re using quite well. If you see no styling, then there’s something messing with the JavaScript of the pro-form. Either the theme or another plugin you’re using, may be causing this.

Please see this article and follow the tips suggested there to spot what’s causing the issue, please: Knowledge Base » Common Troubleshooting Tips

Let me know how it goes. I hope that helps. :)