Cut a piece of clear sticky-backed plastic that is about 1cm larger on all sides than the white card.

Peel off the backing and hold the sticky-back over the white card with the sticky side facing down. Make sure it's in the right position, because you won't be able to move it around once it's stuck down!

Press the sticky plastic down firmly over the card, making sure there are no trapped air bubbles. Then fold the edges underneath.