I am new in WordPress development, This question already asked but that not solve my issue.

I have create custom theme this my theme folder structure

In my custom theme product detail page css not working like this

this is my function.php code

add_action( 'after_setup_theme', 'setup_woocommerce_support' );

function setup_woocommerce_support()
{
  add_theme_support('woocommerce');
}

How to customize my won design in product detail page ?

Advance thanks...! sorry if am not asking correctly.