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You can make your form mobile responsive in two ways:
Method 1: You can follow this guide: http://www.jotform.com/help/311-How-to-make-Forms-Mobile-Responsive
Method 2: You can use the mobile responsive widget instead.
However, I noticed that you are using a custom CSS code that makes your form fields quite large. You can try experimenting and adjusting them.
I hope this helps.