Request help modifying the Donation Form

Item 1:
On small screens, the Donation Form input field for Last Name is styled width=100%.

But the input field for First Name, Address, etc is styled .input-large (210px).

I prefer width=100% for all of the fields.

I checked in \root\administrator\components\com_jdonation\view\field\tmpl\default.php, but it is not the correct file to modify.

Can you tell me which php file assigns input class="input-large" to the input fields on the donation form?
I would like to remove that class so that all of the fields are width 100%.
I understand that this is a core edit, requiring rewrite after updates.

Item 2:
The Donation Form layout is inline-block for large screens and block for small screens.
It is necessary for me to use a long (200 character) title for some of the fields on my Donation Form.
Because of these long titles, my form will look better if it is always in block form, regardless of screen size.

Can you give me some suggestions on how to make the form always "block"?

Thanks!

Hi Dave,
1. With width size of field: Last Name, please go to Back-end -> Joom Donation -> Custom fields -> Open field: Last Name for modifying. In field: Css class, please enter: input-large, and save it. Then, the width size of field: Last Name will be the same with remain fields.
2. Could you please send the screenshot to explain more details about this issue?
Thanks
Dam

1 - thanks! Got it.

2 - screenshots attached. Goal: Donation Form always block, never inline-block.

Thanks.