Use HTML, CSS and Javascript to realise a webpage game.

===========================Game rule===================================

1. When you click a hidden card, it will open and show you its pattern. Then you need to remember their positions as much as possible.
2. When you open two hidden cards each time, and they are matching (with the same pattern), the two cards will show, otherwise they will hidden again.
3. Try to match them and make all of them show in minimal tries and times.