style.css

body {
	font-family: 'Courier New', Courier, monospace;
	color: #444c5c;
}

.modal-overlay {
	position: fixed;
	right: 0;
	left: 0;
	top: 0;
	bottom: 0;
	background-color: gainsboro;
	justify-content: center;
	display: flex;
	align-items: center;
	opacity: .9;
	visibility: visible;
}

.modal {
	background-color: mintcream;
	position: absolute;
	height: 60vh;
	width: 60vw;
	left: auto;
	right: auto;
	bottom: auto;
	top: auto;
	align-content: stretch;
	text-align: center;
	box-shadow: 0px 0px 30px 3px rosybrown;
	padding: 2%;
	overflow: auto;
	opacity: 1;
}

.modal-overlay--invisible {
	visibility: hidden;
}

.modal--invisible {
	display: none;
}

.game_field {
	background-color: #e1b16a;
	position: fixed;
	right: 0;
	left: 0;
	top: 0;
	bottom: 0;
	display: flex;
	flex-direction: column;
	text-align: center;
}

.card {
	background-color: lemonchiffon;
	font-size: xx-large;
	text-align: center;
}

#desk {
	align-self: center;
	height: 80vh;
	width: 80vh;
}

.scene {
	height: 10%;
	margin: 40px 0;
	perspective: 600px;
}

.card {
	position: relative;
	width: 100%;
	height: 100%;
	cursor: pointer;
	transform-style: preserve-3d;
	transform-origin: center right;
	transition: transform 1s;
}

.card.is-flipped {
	transform: translateX(-100%) rotateY(-180deg);
}

.card__face {
	position: absolute;
	width: 100%;
	height: 100%;
	line-height: 260px;
	text-align: center;
	font-weight: bold;
	font-size: 40px;
	backface-visibility: hidden;
	display: flex;
	justify-content: center;
	align-items: center;
}

.card__face--front {
	background: #78a5a3;
}

.card__face--back {
	background: #ce5a57;
	transform: rotateY(180deg);
}