Help Finding Template Feature or Plugin

I am looking for a template or a plugin that will allow me to do something like this

https://www.stevenfurtick.com/

There is a button on the right side labeled “Insight From the Creatives at Elevation” when you press it the screen rolls left and brings in other blog posts and another button on the left that says “return to Pastor Stevens Blog”

Not sure if there is a template or plugin with this feature, but would like to see if I can find one.