Cut the card along the fold to separate front from back.
Trim about 1/8" off of the back of the card on all sides. Use a ruler
and a craft knife for best results.
Turn the front of the card over so that the wrong side is up. Mark
a line 1/2" from all edges of the card. Do the same with the back of
the card. Cut a slit on each corner. See diagram below:
Fold along all the lines. Glue the flaps. Let dry.