Increase the width of Phone fields using CSS.

I have a problem with the phone's fiels

The fiels is reduced and I can't change it

Kindly add this CSS codes on your form using this guide: How-to-Inject-Custom-CSS-Codes

#input_11_full{

width: 90px !important;

}

As for the result: 

I hope this helps. Let us know if you need any further assistance. Thank you.