This is a new creation of mine, the sticky dropdown menu.

Here is a picture of it in action.

This is created using lists. The CSS I use assumes that your menu markdown will be the very first thing in your sidebar.

Here is the markdown for a menu with two dropdown lists.

>Menu

>*List 2 Header
* List 2 item 1
* List 2 item 2
* List 2 item 3

>#

>*List 1 Header
* List 1 item 1
* List 1 item 2
* List 1 item 3

Note that the lists are seperated using a "#" This is to prevent reddit thinking it's one big list.