If you are making a custom Content Management System (CMS) then responsive, almost pure CSS, admin template is for you. It is built with Bootstrap and provide functionality and ease of use at the same time.

If your website have hundreds of categories with each having their own sub categories and so on so forth. Then this Responsive CSS Mega Dropdown Menu is for you.

Download Simple CSS Overlay menu.

Amplify is free full featured accelerated mobile pages (AMP) template. It is a simple HTML template for Jekyll and static website or blog.

A Responsive Drop Down Navigation bar menu built using Bootstrap and jQuery. Complete HTML CSS and JavaScript code is as below.