style.css

/* # normalize */
html {font-family: sans-serif;-ms-text-size-adjust: 100%;-webkit-text-size-adjust: 100%;}body {margin: 0;padding:0;}a {background-color: transparent;}a:active,a:hover {outline: 0;}b {font-weight: bold;}img {border: 0;}svg:not(:root) {overflow: hidden;}

/* # universal styles */

::-moz-selection {
	color: #70B38B;
	text-shadow: none;
}
::selection {
	color: #70B38B;
	text-shadow: none;
}

/*
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
*/

body {
	background: #fff;
	color: #28364f;
	line-height: 1.375rem;
	width: 100%;
	height: 100%;
	max-width: 100vw;
	max-height: 100vh;
	margin: 0;
	font-size: 1.3em;
	font-family: 'Alegreya Sans', sans-serif;
	font-weight: 500;
}

/* # defaults */

img {
	display: block;
}
pre {
	background: #eee;
	padding: 1em;
	border-radius: 6px;
	display: inline-block;
}

/* # site styles */

.unselectable {
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
	cursor: default;
}

#overlay {
	display: none;
	position: absolute;
	align-items: center;
  justify-content: center;
	width: 100vw;
	height: 100vh;
	top: 0;
	left: 0;
	z-index: 1010;
	background-color: rgba(20, 20, 20, 0.7);
}
#overlay div {
	width: 90vw;
	height: 90vh;
	max-width: 600px;
	max-height: 400px;
	background: #fff;
	margin: auto;
	border-radius: 16px;
	z-index: 1020;
	overflow-y: scroll;
}
#overlay div h3 {
	text-align: center;
	margin: auto;
	padding-top: 32px;
	padding-bottom: 8px;
}
#overlay div p {
  -webkit-user-select: initial;
  -moz-user-select: initial;
  -ms-user-select: initial;
  user-select: initial;
	padding: 8px 24px;
	margin: 0;
}
#overlay div ul {
	padding-right: 16px;
}
#overlay div li {
	padding: 6px 0;
}

#status {
	font-weight: bold;
	position: absolute;
	top: -1.5em;
	left: 16px;
}
#status span {
	padding-right: 16px;
}

#menu-btn {
	position: absolute;
	top: -1.5em;
	right: 16px;
}
#menu-list {
	position: absolute;
	top: 2em;
	right: 16px;
	z-index: 600;
	background: #fff;
	padding: 16px;
	text-align: right;
	margin: 0;
}
#menu-list li {
	list-style: none;
}

.btn:hover {
	text-decoration: underline;
}

.restart {
	color: #ff0000;
}

main {
	height: 100vh;
	width: 100vw;
	max-width: 100vw;
	max-height: 100vh;
	display: flex;
	align-items: center;
  justify-content: center;
  overflow: hidden;
}

main * {
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
	cursor: default;
}

main .game-title {
	opacity: 0;
	animation: titleFade 1.5s;
	max-width: 100%;
}

main div.card {
	position: relative;
	display: flex;
	align-items: center;
  justify-content: center;
	flex-direction: column;
	width: 25vw;
	height: 75vh;
	max-height: 540px;
	max-width: 360px;
	margin: 32px;
	/*border: 1px solid #222;*/
	background: #eee;
	border-radius: 16px;
	box-shadow: inset 0 -6px #DDD;
	transition: 0.3s;
}

main div.card:hover {
	transform: translateY(-6px);
}

main div.card .card-title {
	font-weight: bold;
	font-size: 1.35em;
	margin: 1rem;
}

main div.card img {
	width: auto;
	height: auto;
	max-width: 75%;
	max-height: 60%;
	display: block;
	margin: auto;
}

main div.card span.card-stat {
	/*position: absolute;*/
	/*left: 16px;*/
	margin-bottom: 16px;
	display: inline-block;
	background: #fff;
	color: #222;
	border-radius: 6px;
	padding: 8px;
}

main .level-up {
	position: absolute;
	left: 50vw;
	top: 50vh;
	transform: translate(-50%, -50%);

	font-size: 2em;
}

.disabled {}

/* # extras */

hr {
  display: block;
  height: 1px;
  border: 0;
  border-top: 1px solid #ccc;
  margin: 1em 0;
  padding: 0;
}

@keyframes statusBarMoveDown {
	0% {
		top: -2em;
		opacity: 0;
	}
	100% {
		top: 16px;
		opacity: 1;
	}
}

@keyframes moveCardDown {
  0% {top: 0;}
  100% {top: 100vh;}
}

@keyframes titleFade {
	0% {opacity: 1;}
	80% {opacity: 1;}
	100% {opacity: 0;}
}

@keyframes moveCardUp {
  0% {
  	top: 100vh;
  }
  100% {
  	top: 0;
  }
}

@keyframes popupText {
	0% {
		transform: translateY(0) rotateZ(0deg);
		opacity: 1;
	}
	50% {
		opacity: 1;
	}
	100% {
		transform: translateY(16px) rotateZ(-9deg);
		opacity: 0;
	}
}

@keyframes cardShake {
	0% { transform: rotateZ(9deg); }
	20% { transform: rotateZ(-6deg); }
	40% { transform: rotateZ(6deg); }
	60% { transform: rotateZ(-3deg); }
	80% { transform: rotateZ(3deg); }
	100% { transform: rotateZ(0deg); }
}


/* # responsive rules */


/* ## tablets and small screens */
@media only screen and (max-width: 960px) {
	h1 { font-size: 2.5rem; }
	h2 { font-size: 1.6rem; }
	h3 { font-size: 1.5rem; }
	h4 { font-size: 1.125rem; }
	main {
	  flex-direction: column;
	}
	main div.card {
		align-items: center;
	  justify-content: center;
		flex-direction: column;
		width: 30vw;
		height: 75vh;
		max-height: 540px;
		max-width: 360px;
	}
}

@media only screen and (max-width: 960px) and (orientation: landscape) {
	main div.card {
		height: calc(100vh - 4rem);
		margin: 16px;
		margin-top: 3.75rem;
	}
	main div.card span.card-stat {
		margin-bottom: 4px;
	}
	main div.card span.card-stat:last-child {
		margin-bottom: 12px;
	}
}

@media only screen and (max-width: 960px) and (orientation: portrait) {
	main div.card {
		margin: 6px;
		margin-right: 0;
		max-height: 50vh;
		height: 50vh;
	}
	main div.card:last-child {
		margin: 6px;
		max-height: 50vh;
		height: 50vh;
	}
	h2 {
		font-size: 1.5rem;
	}
	#status {
		max-width: 65vw;
	}
}

@media only screen and (max-width: 600px) and (orientation: landscape) {
	h2 { font-size: 1.4rem; }
	main div.card span.card-stat {
		margin-bottom: 4px;
		padding: 4px;
	}
	main div.card span.card-stat:last-child {
		margin-bottom: 6px;
	}
	main div.card {
		height: calc(100vh - 3.5rem);
		margin: 8px;
		margin-top: 3.5rem;
	}

}