You need to enqueue both the parent theme style.css and the child theme style.css in your child theme.

function my_theme_enqueue_styles() { 
 $parent_style = 'parent-style'; 
 wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );
 wp_enqueue_style( 'child-style', get_stylesheet_directory_uri() . '/style.css', array( $parent_style ), wp_get_theme()->get('Version') );
}
add_action( 'wp_enqueue_scripts', 'my_theme_enqueue_styles' );

A few things are happening here:

• You’re setting the name of the parent theme’s style.css
• You’re enqueuing the parent theme’s style.css
• You’re enqueuing the child theme’s style.css