Adjusting height of tab

I installed the plugin and it works great. But when I open it, it runs off the top of my screen, and I can’t close it, plus it cuts off content on the top. I have played around with the CSS but can’t find where to adjust it so it only pops up about 30% of the screen and I can click on the tab again to close it. I appreciate the help.

https://wordpress.org/plugins/wp-slide-out-tab/