Responsive Multi-level Sidebar Menu Example

A responsive sidebar menu with multi-level sub-menus written in plain JavaScript and CSS.

Lorem ipsum, dolor sit amet consectetur adipisicing elit. Incidunt vel illum fuga unde cum, voluptates magni molestias eveniet culpa autem ut, totam veniam, suscipit tempore ullam pariatur est at asperiores?

Lorem ipsum, dolor sit amet consectetur adipisicing elit. Incidunt vel illum fuga unde cum, voluptates magni molestias eveniet culpa autem ut, totam veniam, suscipit tempore ullam pariatur est at asperiores?

Lorem ipsum, dolor sit amet consectetur adipisicing elit. Incidunt vel illum fuga unde cum, voluptates magni molestias eveniet culpa autem ut, totam veniam, suscipit tempore ullam pariatur est at asperiores?