Cannot get full screen effect with embedded map code

Hi, 

I'm attempted to get the full screen effect when a user goes to this page

https://www.vernonburggroup.com/digital-equity-map-fullscreen

I've removed all padding and toggled the "fill screen" on the section. I also hid the footer and header yet I get this dark gray background that looks like it's coming from the <div id="siteWrapper" > that shows up at the bottom of the map. The scaling gets worse depending on the screen size. 

Any advice would be appreciated? 

Thank you @tuanphan  That worked perfectly!