Help for the Challenged

Can someone help me?

Which way does a card go in its envelope?
Does the front of the card face the flap that you seal..
or the other way...

I have this moment of uncertainty every time.
I don't want the person that opens it to be faced
with the back of the card, but then you see the back of
the card through the flat part of the envelope.

You see my problem?

This is why I hate multiple choice- I can come up with
arguments for many different answers.

Help appreciated....