Changing submit button styling

Well, you didn't share a URL to your form so we can't see what theme you're using, can't see what style is currently being applied and can't tell you what you need to know.

If you can share a URL to your form then that would be a start. Most likely, you're going to need to copy an existing button style from your theme stylesheet, then create a new CSS rule to apply it to your Gravity Form button. Once we can see the form we can tell you something more definitive.

Yeah, not sure about which classes you have available for different button styles so you may need to contact your theme support guys for that.. I see it's from these folks.

http://para.llel.us/

As far as the buttons, you'll need to target the Gravity Forms submit button and next/previous button elements.. here's an example you can start with.

[css]
body .gform_wrapper .gform_footer input[type=submit],
body .gform_wrapper .gform_footer button,
body .gform_wrapper .gform_page_footer input[type=submit],
body .gform_wrapper .gform_page_footer button {
	color: #790000
}

If you need more samples of targeting the form elements for CSS manipulation, you can find those here.

http://www.gravityhelp.com/documentation/page/CSS_Targeting_Samples