How can I modify the contact form in the Capital theme?

Good morning everyone!

I am looking to modify a copy of the contact form that came with the Capital theme.
I want to add a couple of new sections to it and am having trouble getting the section titles fonts to
match what the default font is on the contact form. I am also struggling with getting the fields on the
form to contain all the text that is in them. I would like for those fields that cannot fit the text properly to span
the width of the container. In addition to all that ( I know I am asking a lot :confused: ) I would love to be able to change the section titles for each field.
I hope I am explaining this properly. You can see my page here: https://www.fullspectrumsolutions.com/pages/replacement-parts
I believe once you see the form the questions I am asking will become obvious. I am inserting the code for the two sections I am struggling with.


        {% assign name_attr = 'page.contact.phone' | t | handle %}