Hello, @Abdullah Ashraf,
First of all, my-account, cart, and checkout are WooCommerce default pages and those are fetching from the WooCommerce plugin using the shortcodes, so our theme does not have any influence on it except the styling… It by default took the primary color of the theme.
WooCommerce does not have a lot of options to customize the registration form. Read this post https://quadlayers.com/customize-woocommerce-registration-form/
Same for Cart and Checkout pages, you have to refer to the WooCommerce articles or support.
Furthermore, you can use the 8Themes Layout Options for the page to change the style with the given possible options by editing the particular page: https://postimg.cc/rzZ4FVfx
If you want to change the color, margins, paddings, etc, you can use Custom CSS for it.
Regard 8Themes Team.