Can I get the source code of my form?

I have my own hosting. Am I able to get the html and css source code? Thanks.

Yes, this is possible.

You can read more about how to embed your form in your site here: http://www.jotform.com/help/34-Adding-a-Form-to-a-Web-Page

If you want to retrieve the full source code of your form, you can see how to do it here: http://www.jotform.com/help/104-How-to-get-the-Full-Source-Code-of-your-Form 

Also, I suggest you to check the following guide: http://www.jotform.com/help/67-Which-Form-Embed-Code-Should-I-Use

Let us know if you need further assistance.
Best Regards.