Why phone field is not showing properly when viewed on mobile device?

Form

I have created the form located in the link above.  if the form is on the computer, the fields are ok.  However, if you navigate on your phone, the "Cell Phone" field is shortened and will not allow more than 5 characters.  I have looked to see what the issue is but cannot locate a fix.

Please insert the below CSS code to your Custom CSS Field:

@media only screen and (max-device-width : 812px) {

  input#input_3_full {

    width: 170px!important;

}

}

That will fix your issue with number field width.

Let us know if you have any further questions.

Thank you!