add search box to off-canvas menu

off-canvas-search.php

// Advanced Menu - off-canvas before menu items
function wpba_demo_offcanvas_menu_before( $type, $settings, $id ) { ?>
	<style>
	.wpba-menu-content { margin-top: 50px; padding: 40px; padding-bottom: 10px; }
	</style>
	<div class="wpba-menu-content">
		<div class="wpba-menu-search">
			<?php echo get_search_form(); ?>
		</div>
		<h3>About us</h3>
		<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
	</div>
	<?php
}
add_action( 'pp_advanced_menu_before', 'wpba_demo_offcanvas_menu_before', 10, 3 );