I am currently trying to create a button so that on click they will be able to expand a container to full screen

i have a main container as well as a side bar, in the main container there is many smaller containers. i have a button that will hide the side bar or make it comeback but i am wanting to create a button that will make the main container the full screen, even over everything else besides the top bar. is this possible and if so how

Yes, it’s possible. Use CSS to toggle a fullscreen class on the main container when the button is clicked.