Maps and Apps Gallery - header icon is squished

Question

I created the Maps and Apps Gallery using ArcGIS Online.  I added an image to be displayed in the top right corner and I like how it looks, but when I added this same image to the Maps and Apps Gallery that I downloaded from GitHub, the image re-sized.

It looks like this in the Maps and Apps Gallery using ArcGIS Online:

and it looks like this in the Maps and Apps Gallery that I am customizing:

Not sure why it shrinks?

ChayaBalsiger · Accepted Answer

Thanks!  I just changed the "applicationIcon" line of code to look at the location of my image and that solved the problem!