Begin with a piece of printed paper that matches your handmade card. You want to make sure that you're using paper, and not cardstock for this so it folds easily and doesn't add a lot of weight.
Lay the envelope on top of the printed paper, and slide it down so it sits about 1/2" lower than the bottom edge of the paper. Use a ruler and a pen or pencil to trace around the edges of the envelope. Cut about 1/8" in from the drawn line so your lining is slightly smaller than your envelope.
Use a tape runner, such as a
or a glue stick to run a line of adhesive at the bottom and top of the printed paper. Slide into envelope, position so the lining sits right below the envelope's glue line, and secure into place with the adhesive. A
can help you get the perfect crease when you fold the flap closed and smooth along the envelope's existing fold line.
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