Phone number fields are over-styled and do not blend well with other fields

Problem/Motivation

On a fresh installation this phone number field stands out with its own, somewhat opinionated styling rules that seem to go beyond the functional basics. I imagine most sites that choose to use this field either deal with that non-standard look or add custom styling rules to address it.

Steps to reproduce

1. Install Drupal and this phone number module.
2. Add a phone number field to a form with other fields.
3. View the form and see that the phone number field does not look, stylistically, like the other fields in the form.

Example:

Proposed resolution

Allow the site's current theme to style phone number fields by removing any non-essential style rules from them.

Remaining tasks

MR + review.

User interface changes

Phone number fields look more like, and blend better with, other fields.

API changes

None.

Data model changes

None.