Form being displayed incorretly on magento

Hi I have a form setup everything works fine - http://form.jotformpro.com/form/50403683732957

but when I add to our magento page the phone number box reduces in size

Any help would be great 

Thanks

Hi,

Upon checking your website and viewing it on different browsers, I see that the width of the input fields are working as expected:

Google Chrome:

Firefox:

I cloned your form and I see there are problems with your CSS and also the responsive option is set in the Preferences, we suggest that you enable the one in the Form Designer. I've edited your form and corrected some errors, here it is: http://form.jotformpro.com/form/50494715399972. You can clone it using this guide: http://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL 

Do try embedding that one and see if it works.

Thank you.