JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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1. You can use our Inject Custom CSS Feature. You can change your form's style by injecting your custom css codes.
2. You can download your form's full source code which includes complete CSS file and JS files. With this, you can customize your form's style offline by modifying the downloaded CSS file. To download your form's full source code.
An it you want to change them you can do it inside of Form Builder by selecting Theme option or by selecting Preferences/Form Styles/Themes.
Hope this will help. Let us know if you need further assistance.