Hide an HTML element by class based on WP user role

functions.php

<?php

// Hide the Inventory nav item for everybody except admins and buyers
function rw_hide_inventory_link_for_role() {
	$allowed_roles = ['administrator', 'rw-buyer']; // these user roles can see the item
	$hide = true; // default to hiding it
	if ( is_user_logged_in() ) { 
		$user = wp_get_current_user();
		$roles = (array)$user->roles;
		foreach($roles as $role) {
			if(in_array($role, $allowed_roles)) { // if this role is in allowed_roles, don't hide it
				$hide = false;
			}
		}
	} 
	// if hide is true, dump the CSS to hide it.
	if($hide): ?>
		<style>
			.inventory-link { display: none !important; }
		</style>
	<?php
	endif;
}
add_action('wp_head','rw_hide_inventory_link_for_role');