how to add new CSS classes to a specific div on a specific archive page

To add new CSS classes to a specific div on a specific archive page in WordPress, you can use the body_class filter hook to add a custom class to the body tag and then use CSS to target the specific div.

Here’s how you can add new CSS classes to a specific div on a specific archive page:

1. Identify the archive page where you want to add the new CSS classes. For example, let’s say you want to add the new CSS classes to the archive page for a custom post type called “my_custom_post_type”.
2. Open the functions.php file of your theme or child theme and add the following code:

phpCopy codefunction add_custom_classes_to_archive_body( $classes ) {
  if ( is_post_type_archive( 'my_custom_post_type' ) ) {
    $classes[] = 'my-custom-class';
  }
  return $classes;
}
add_filter( 'body_class', 'add_custom_classes_to_archive_body' );

This code adds the class “my-custom-class” to the body tag of the archive page for the “my_custom_post_type” custom post type.

3. Save the functions.php file.
4. Open the archive page template file for the custom post type (e.g. archive-my_custom_post_type.php) and find the div that you want to add the new CSS classes to.
5. Add the following CSS code to your theme’s stylesheet:

cssCopy code.my-custom-class .specific-div {
  /* Add your custom styles here */
}

Replace .specific-div with the class or ID of the specific div that you want to add the new CSS classes to. Also, add your custom styles to this code.

6. Save the stylesheet.

Now, when you visit the archive page for the “my_custom_post_type” custom post type, the “my-custom-class” class will be added to the body tag and you can use CSS to target the specific div and add your custom styles.