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<div class="menu-class">
	<?php
	$menuParameters = array(
		'theme_location'    => 'button_menu',
		'container'         => false,
		'echo'              => false,
		'link_before'       => '<span>',
		'link_after'        => '</span>',
		'items_wrap'        => '%3$s',
		'depth'             => 0,
	);
	echo strip_tags(wp_nav_menu( $menuParameters ), '<a>, <span>' );
	?>
</div>

<div class="menu-cass">
	<?php
	$menuParameters = array(
		'theme_location'    => 'button_menu',
		'container'         => false,
		'echo'              => false,
		'items_wrap'        => '%3$s',
		'depth'             => 0,
	);
	echo strip_tags(wp_nav_menu( $menuParameters ), '<a>' );
	?>
</div>