index.css

/* General */
*{
	box-sizing: border-box;
	margin: 0;
	padding: 0;
	font-family: "Helvetica";
	-webkit-tap-highlight-color: rgba(255, 255, 255, 0);
	text-shadow: 0px 0px 1px rgba(0, 0, 0, 0.05);
	-webkit-touch-callout: none; 
	-webkit-user-select: none;
	-moz-user-select: none; 
	-ms-user-select: none;
	user-select: none; 
}

p, h2, span, a{
	color: #444;
}

p, span{
	font-size: 1.1em;
}

h2{
	font-weight: 400;
}

#main-container{
	position: relative;
	text-align: center;
}

/* Rules */
#rules-container{
	position: relative;
	width: 80%;
	max-width: 800px;
	left: 50%;
	transform: translateX(-50%);
	-webkit-transform: translateX(-50%);
	-moz-transform: translateX(-50%);
	-ms-transform: translateX(-50%);
	margin-top: 45px;
}

#rules-container h2{
	font-size: 2em;
}

#rules-container p{
	text-align: justify;
}

#rules-container div:nth-child(2){
	margin-top: 45px;
}

#rules-container p:not(:nth-child(1)){
	margin-top: 15px;
}

#rules-container .mobile{
	display: none;
}

.rules-title {
	font-weight: 550;
}

/* Player score display */
#player-container{
	position: relative;
	margin-top: 100px;
}

.player-group{
	position: relative;
	display: inline-block;
	width: 150px;
	perspective: 500px;
	-webkit-perspective: 500px;
	-moz-perspective: 500px;
	-ms-perspective: 500px;
  	perspective-origin: 100% 100%;
  	-webkit-perspective-origin: 100% 100%;
  	-moz-perspective-origin: 100% 100%;
  	-ms-perspective-origin: 100% 100%;
}

.sphere{
	position: relative;
	left: 50%;
	transform: translateX(-50%);
	-webkit-transform: translateX(-50%);
	-moz-transform: translateX(-50%);
	-ms-transform: translateX(-50%);
	width: 100px;
	height: 100px;
	border: 1px solid #e2e2e2;
	border-radius: 50%;
	overflow: hidden;
}

.fill{
	position: absolute;
	bottom: 0%;
	height: 0%;
	width: 100%;
}

#computer .fill{
	background-color: #888;
}

#human .fill{
	background-color: #055194;
}

.cover{
	position: absolute;
	width: 100%;
	height: 100%;
	background: radial-gradient(circle at 50% 0px, rgba(255, 255, 255, 0.75), rgba(0, 0, 0, 0.1));
	background: -webkit-radial-gradient(circle at 50% 0px, rgba(255, 255, 255, 0.75), rgba(0, 0, 0, 0.1));
	background: -moz-radial-gradient(circle at 50% 0px, rgba(255, 255, 255, 0.75), rgba(0, 0, 0, 0.1));
	background: -ms-radial-gradient(circle at 50% 0px, rgba(255, 255, 255, 0.75), rgba(0, 0, 0, 0.1));
}

.shadow{
	position: relative;
	left: 50%;
	height: 100px;
	width: 100%;
	opacity: 0.15;
	border-radius: 50%;
	background: radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.1) 40%, rgba(0, 0, 0, 0) 50%);
	background: -webkit-radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.1) 40%, rgba(0, 0, 0, 0) 50%);
	background: -moz-radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.1) 40%, rgba(0, 0, 0, 0) 50%);
	background: -ms-radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.1) 40%, rgba(0, 0, 0, 0) 50%);
	transform: rotateX(90deg) translateX(-50%);
	-webkit-transform: rotateX(90deg) translateX(-50%);
	-moz-transform: rotateX(90deg) translateX(-50%);
	-ms-transform: rotateX(90deg) translateX(-50%);
}

.score-title {
	padding-top: 10px;
}

/* AI prediction display */
#prediction-container{
	position: relative;
	left: 50%;
	transform: translateX(-50%);
	-webkit-transform: translateX(-50%);
	-moz-transform: translateX(-50%);
	-ms-transform: translateX(-50%);
	width: 250px;
	padding: 15px 20px;
	border-radius: 5px;
	border: 1px solid #ccc;
	box-shadow: 0px 1.5px 5px 0px rgba(0, 0, 0, 0.2);
	margin-top: 50px;
	margin-bottom: 30px;
	cursor: pointer;
}

#prediction-container #next-prediction{
	display: none;
}

#prediction-container:hover #next-prediction, #prediction-container:active #next-prediction{
	display: inline;
}

#prediction-container:hover #button-label, #prediction-container:active #button-label{
	display: none;
}

/* Gameover */
#gameover-container{
	display: none;
	margin-top: 50px;
	margin-bottom: 30px;
}

#gameover-container h3{
	font-weight: 400;
}

#new-game{
	position: relative;
	left: 50%;
	transform: translateX(-50%);
	-webkit-transform: translateX(-50%);
	-moz-transform: translateX(-50%);
	-ms-transform: translateX(-50%);
	width: 200px;
	padding: 10px 15px;
	border: 1px solid #ccc;
	border-radius: 5px;
	box-shadow: 0px 1.5px 5px 0px rgba(0, 0, 0, 0.2);
	font-size: 1.1em;
	margin-top: 15px;
	cursor: pointer;
}

/* Responsiveness */
@media screen and (max-width: 321px){
	.player-group{
		position: relative;
		display: inline-block;
		width: 120px;
		perspective: 500px;
		-webkit-perspective: 500px;
		-moz-perspective: 500px;
		-ms-perspective: 500px;
	  	perspective-origin: 100% 100%;
	  	-webkit-perspective-origin: 100% 100%;
	  	-moz-perspective-origin: 100% 100%;
	  	-ms-perspective-origin: 100% 100%;
	}	
}

@media screen and (max-width: 425px){
	#rules-container .desktop{
		display: none;
	}

	#rules-container .mobile{
		display: block;
	}

	.player-group {
		padding: 0 20px;
	}

	.player-group{
		touch-action: manipulation;
  		cursor: pointer;
	}
}