Add expand functionality to additional button

I have a button on my site that currently anchors down to the current collapse-o-matic button. How would l go about adding the expand functionality to that button as well so it anchors down and expands at the same time?

Here is a link to my site. The “SCHEDULE A PERSONALIZED TOUR” button in the top right is what I would like to add the expand functionality to – http://lakevillagedaybreak.com/

All and any insight is appreciated! Thanks in advance!

https://ww.wp.xz.cn/plugins/jquery-collapse-o-matic/