How to Create Dropdown menubar

I am running my website. website is based on Restaurant . I have posted a new and many food category and list in the website after doing seo of that page then i get ranking on first page of google on that Restaruant topics which i have posted. but few day’s i have checked my ranking first i have checked in ranking in the morning then there is no change but after few hour i think in the evening i loos my ranking and my web page is not visible in google’s 10 pages.

Hi matin. Your post seems to have nothing to do with the title. Do you want to discuss drop menus, or SEO?