How to make a persistent menu like in a Facebook Messenger Bot

know how to make a slider menu in ionic 3, but I didn’t get a way to reduce the height so it doesn’t take the screen’s height.

Actually I’m trying to make a persistent menu like the one in Facebook Messenger like this https://core0.staticworld.net/images/article/2016/07/fbbotsmenu-100669640-orig.png

According to the documentation we can only update the width $menu-width.

Any clue please?