Page-Width Coding Block Issues to Import a Map.

Hello!

I'm trying to insert a coding block of some maps brought in from ArcGIS in a Brine template page, using some code suggested by ArcGIS.  However, when the map is brought in, it's very tiny, and does not fill the entirely of the block.  When I add any specific pixel widths to the code, it extends outward to the right so a majority of the map is out of view. 

I'd like to get it so that it at least extends the same width as the image at the top of the page.

This is what I'm using:
 

<iframe width=”100%" height=”750” frameborder="0" scrolling="no" marginheight="0" marginwidth="0"
src="https://njrgp.maps.arcgis.com/apps/opsdashboard/index.html#/a856ba6b11df4a0bb5098b8ad1cadda3"></iframe>

Sadly, my coding skills sort of peaked, then went into a coma around 1999, so I'm out of ideas trying to figure this out.  
 

Thank so much!
Jason Wickersty

Do you have content insets enabled? If so this is likely causing the problem, if they are not important to your websites design I would recommend setting them to 0 instead of trying to code a solution. 

https://support.squarespace.com/hc/en-us/articles/212511488-Content-inset

THANK YOU SO MUCH!!!!!!  A lifesaver and a timesaver, you are.  That did the trick!