I don't think there is an in game way to reduce screen size but (depending on what browser you are using ) there should be three lines or three dots at the top corner of your web browser. Click that and there is an option listed to allow you to zoom in and out your screen size.
It's still not too late to get in on the giveaways. #steemmonsters tag.
That sucks that you didn't realize you had enough. Good luck in your next monster battle.
Aha - a browser thing! I will try that, thank you!
Yes, I'll enter some more contests.
LOL about the monsters. It was a slap my head thing. Funny more than sad and at least now I have some more cool cards!
Thank you for your help!