Suggestions for styling a Formstack form

CSS

Form background color: #333333

Text color on background: #ffffff

Submit button color, header/section color: #cfb87c

Other buttons background colors: #ffffff, #eeeeee

Border radius: nothing greater than 2px.

Horizontal rules #555555, #eeeeee

Borders: #ddd

General suggestions

Strive to maintain AAA color contrast ratio between text/background using this tool:

https://webaim.org/resources/contrastchecker/