I want the field for user role (customer, foretag_1) to have different background colors to make them more easily distinguishable. See the image attached.

Here’s the PHP code used to add field for user role in Woocommerce admin order list:

add_filter('manage_edit-shop_order_columns', 'add_column_heading', 20, 1);
function add_column_heading($array) {
    $res = array_slice($array, 0, 2, true) +
            array("customer_role" => "Customer Role") +
            array_slice($array, 2, count($array) - 1, true);
    return $res;
}
add_action('manage_posts_custom_column', 'add_column_data', 20, 2);
function add_column_data($column_key, $order_id) {
    // exit early if this is not the column we want
    if ('customer_role' != $column_key) {
        return;
    }
    $customer = new WC_Order( $order_id );
    if($customer->user_id != ''){
            $user = new WP_User( $customer->user_id );
             if ( !empty( $user->roles ) && is_array( $user->roles ) ) {
            foreach ( $user->roles as $role )
               echo $role;
        }
    }
}

I haven’t tried anything yet due to insufficient knowledge of how to achieve background colors based on user roles.

I’ve read the following threads but lack the know-how to adjust and implement the solutions for my specific needs.

Highlight WooCommerce admin orders list based on order payment method
Highlight Woocommerce admin orders list when order contains a regular product
Change background color link based on payment method in Woocommerce admin orders list