Cannot shrink company logo in email notifications

I added my company logo to my autoresponder email notifications, but it is enormous and does not respond when I try to shrink it.  I was able to use the same logo file in the form itself (and literally everywhere else) without this problem.

Please advise.

You can re-size it like this.

Just don't forget to save the changes.

You can also create a new Autoresponder Email. The logo will be much smaller. 

Setting up an Autoresponder Email