header.php

<!DOCTYPE html>
<html <?php language_attributes(); ?>>
<head>
	<meta charset="<?php bloginfo( 'charset' ); ?>">
	<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
	<?php wp_head(); ?>
</head>
<body <?php body_class(); ?>>

<nav class="navbar navbar-expand-md navbar-dark bg-dark">
	<div class="container">
		<a class="navbar-brand" href="<?php echo esc_url( home_url() ); ?>">
			<?php echo esc_html( get_bloginfo( 'name' ) ); ?>
		</a>
		<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent">
			<span class="navbar-toggler-icon"></span>
		</button>
		<?php
		wp_nav_menu(
			array(
				'theme_location'  => 'menu-top',
				'depth'           => 2,
				'container'       => 'div',
				'container_class' => 'collapse navbar-collapse',
				'container_id'    => 'navbarSupportedContent',
				'menu_class'      => 'nav navbar-nav mr-auto',
				'fallback_cb'     => 'WP_Bootstrap_Navwalker::fallback',
				'walker'          => new WP_Bootstrap_Navwalker(),
			)
		);
		dynamic_sidebar( 'navbar' )
		?>
	</div>
</nav>
	<!DOCTYPE html>
	<html <?php language_attributes(); ?>>
	<head>
	<meta charset="<?php bloginfo( 'charset' ); ?>">
	<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
	<?php wp_head(); ?>
	</head>
	<body <?php body_class(); ?>>

	<nav class="navbar navbar-expand-md navbar-dark bg-dark">
	<div class="container">
	<a class="navbar-brand" href="<?php echo esc_url( home_url() ); ?>">
	<?php echo esc_html( get_bloginfo( 'name' ) ); ?>
	</a>
	<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent">
	<span class="navbar-toggler-icon"></span>
	</button>
	<?php
	wp_nav_menu(
	array(
	'theme_location' => 'menu-top',
	'depth' => 2,
	'container' => 'div',
	'container_class' => 'collapse navbar-collapse',
	'container_id' => 'navbarSupportedContent',
	'menu_class' => 'nav navbar-nav mr-auto',
	'fallback_cb' => 'WP_Bootstrap_Navwalker::fallback',
	'walker' => new WP_Bootstrap_Navwalker(),
	)
	);
	dynamic_sidebar( 'navbar' )
	?>
	</div>
	</nav>