Width Responsiveness

Hi There,

I’m having trouble making the width of my forms responsive on mobile. If I use the class ‘textarea’, I’m able to get my comments box to be responsive. However, if I use the class ‘text’, it doesn’t work. Is there a list of classes that I should be using? Sorry for the intro question, this has had me stuck for sometime now.

website form: usergrowthpartners.com/contact-us

Thank you!

https://wordpress.org/plugins/contact-form-7/