IxDA site notification
This is a good spot to put it. Well done IxDA, I would expect no less from you. Notice the yellow is nested inside two dark stripes, making it hard to miss. It doesn’t disappear after it’s been there for a while, which is my preferred behavior of site notifications like this. If you show me something important, and I turn my head to do something else (which happens way more often than you think) I might miss it and kick the dirt with frustration because I can’t get it back.
Don’t make your users frustrated. They will leave and you’ll have no idea why.