Cart Colors/Navigation Widget

Good Evening,

Hope I am in the correct forum…I am using WooCommerce – MyStile Theme

1.) I’m searching for info on how to change the color for my cart page.
a.) “+” and “-” buttons on my cart page (currently they are brown)
b.) “Apply Coupon” button on my cart page (currently brown)
b) “Update Cart” on my cart page (currently brown)
(and even the color on my navigation button when accessing the site on a mobile device; I would like to change the same brown color)

2.) Is there any way to add a widget between the homepage featured image and the main navigation menu?

https://mecanwoodworks.com/cart/

Thank you in advance for your time and help.