Add description to Divi theme menu items

Add description to Divi theme menu items

<?php
function nav_menu_description( $item_output, $item, $depth, $args ) {
  if ( !empty( $item->description ) ) {
   $item_output = str_replace( $args->link_after . '</a>', '<span class="menu-item-description">' . $item->description . '</span>' . $args->link_after . '</a>', $item_output );
 }
return $item_output;
}
add_filter( 'walker_nav_menu_start_el', 'nav_menu_description', 10, 4 );
?>

CSS
span.menu-item-description {
display: block;
color: #999999;
}

#top-menu li {
vertical-align: top;
}