Style of Hidden Cards

Because its possible, to spy all players hand with a
"Solitaire" Option in module , it´s neccessary, to keep the own cards in hand also hidden.

To read them better, i will change the current dark "hidden" style to this style above.
So only a small backside icon in top right edge of card shows the hidden modus, and you the player can read the card now hidden also better in his hand.