noname/theme/style/cardback/feicheng.css

.card:empty,
.card.infohidden {
	background: url("image/feicheng.png");
	background-size: 100% 100%;
}
.card.infohidden:not(.infoflip) {
	background: url("image/feicheng2.png");
	background-size: 100% 100%;
}