So I have read the blog on customizing the organization theme, and I have changed the header background color. In my story map, I then selected my organization theme. but instead of changing the header background color it only changed the background color for the page selector on the side (see attached image).
I have no issue with going into the AGOL assistant and changing the Json to override the background color, but I am not sure which syntax to use to do this. Any guidance for this would be great. Normally I would pull the code down and host on our own servers, but due to security issues I cannot do this at the time.