[Theme: Avada] Enqueued scripts and css but functions/styling not taking affect

Hi,

I’ve enqueued scripts and css files in the functions.php file in the Avada child theme and according to Firebug, both scripts and the css file are being loaded but the scripts functions and the styling is not taking affect.

Here’s the code:

<?php
function avada_child_scripts() {
	if ( ! is_admin() && ! in_array( $GLOBALS['pagenow'], array( 'wp-login.php', 'wp-register.php' ) ) ) {
		$theme_info = wp_get_theme();
		wp_enqueue_style( 'avada-child-stylesheet', get_template_directory_uri() . '/style.css', array(), $theme_info->get( 'Version' ) );
	}
}
add_action('wp_enqueue_scripts', 'avada_child_scripts', 'wpb_adding_styles');

// Umut add custom search form shortcode
function wpbsearchform( $form ) {

    $form = '<form role="search" method="get" id="searchform" action="' . home_url( '/' ) . '" >
    <div><label class="screen-reader-text" for="s">' . __('Search for:') . '</label>
    <input type="text" value="' . get_search_query() . '" name="s" id="s" />
    <input type="submit" id="searchsubmit" value="'. esc_attr__('Search') .'" />
    </div>
    </form>';

    return $form;
}

add_shortcode('wpbsearch', 'wpbsearchform');
// Umut END

// Umut

    function umut_nested_navigation() {

        wp_enqueue_script('jquery');

        wp_register_script('sliding-menu',get_stylesheet_directory_uri().'/js/jquery-sliding-menu.js');
        wp_register_script('nested-navigation',get_stylesheet_directory_uri().'/js/nested-navigation.js');
        wp_register_style('sliding-menu-css',get_stylesheet_directory_uri().'/css/jquery-sliding-menu.css');

        wp_enqueue_script('sliding-menu');
        wp_enqueue_script('nested-navigation');
        wp_enqueue_style( 'sliding-menu-css');

    }

add_action( 'wp_enqueue_scripts', 'umut_nested_navigation');

    // End Umut

?>

Link to the website

The end product is supposed to look like this nested navigation

Can anyone point me in the right direction?

Best regards,
Umut