How to make fields bigger on mobile?

I have a couple of Forms. How do I make the form fields bigger on mobile?
For example, the "Go to Order Form" button on SIM for America form. But, In
general, I'd like options for making certain titles and fields BIGGER
Thanks,

I would like to inform you that jotform forms are optimized for mobile. However if you want to make them more responsive, you can simply follow this guide: How to make Forms Mobile Responsive.

 

If you need further assistance, do let us know.
Regards.