* {
	box-sizing: border-box;
}
	
body {
	background-image: radial-gradient(circle, #ee4b2b, #553c9a);
	padding-left: 0;
	padding-right: 0;
	margin-left: auto;
	margin-right: auto;
	display: table;
	text-align: center;
	font-family: Verdana, Helvetica, sans-serif;
	text-shadow: 2px 2px 4px #000;
}

.back-link {
	position: absolute;
	top: 5%;
	left: 5%;
	color: #fff;
}

h1 {
	font-size: 2.5vw;
	color: #fff;
	font-family: Verdana, Helvetica, sans-serif;
}

.link {
	font-size: 1vw;
}

/* for Twitter, GitHub icon */
.fa-brands {
	padding-left: 10px;
	font-size: 1.5vw;
	text-decoration: none;
	margin: 5px 2px;
}

.fa-brands:hover {
	opacity: 0.7;
	text-decoration: none;
}

.fa-twitter {
	color: #55ACEE;
}

.fa-github {
	color: #000000;
}

span {
	color: aliceblue;
}

/* select option normal, slow, fast */  
.options {
	margin-top: 1vw;
	margin-bottom: 1vw;
}
	  
label {
	font-size: 1vw;
	font-family: Verdana, Helvetica, sans-serif;
	font-weight: bold;
	color: #fff;
}
	  
select {
	box-shadow: 2px 5px 8px #000;
	border-radius: 0.3vw;
	color: #8c0585b7;
	background-color: #fff;
	font-size: 1vw;
	font-family: Verdana, Helvetica, sans-serif;
}

/* replay button */
button {
	margin-left: 1vw;
	-webkit-box-shadow: 0rem 0rem 1.25rem 0.2rem #fff;
	-moz-box-shadow: 0rem 0rem 1.25rem 0.2rem #fff;
	box-shadow: 0rem 0rem 1.25rem 0.2rem #fff;	
}

.glow-on-hover {
	width: 6vw;
	height: auto;
	border: none;
	outline: none;
	color: #8c0585b7;
	background-color: #fff;
	cursor: pointer;
	position: relative;
	z-index: 0;
	border-radius: 10px;
}

.glow-on-hover:before {
	content: '';
	background: linear-gradient(45deg, #ff0000, #ff7300, #00ffd9, #00ffa2, #00d9ff, #002bff, #7a00ff, #ff00c8, #ff0000);
	position: absolute;
	top: -2px;
	left:-2px;
	background-size: 400%;
	z-index: -1;
	filter: blur(5px);
	width: calc(100% + 4px);
	height: calc(100% + 4px);
	animation: glowing 20s linear infinite;
	opacity: 0;
	transition: opacity .3s ease-in-out;
	border-radius: 10px;
}

.glow-on-hover:active {
	color: #fff;
}

.glow-on-hover:active:after {
	background: transparent;
}

.glow-on-hover:hover:before {
	opacity: 1;
}

.glow-on-hover:after {
	z-index: -1;
	content: '';
	position: absolute;
	width: 100%;
	height: 100%;
	background: #fff;
	left: 0;
	top: 0;
	border-radius: 10px;
}

@keyframes glowing {
	0% { background-position: 0 0; }
	50% { background-position: 400% 0; }
	100% { background-position: 0 0; }
}

/* info "use arrow keys" */
.info {
	font-size: 1rem;
	font-family: Verdana, Helvetica, sans-serif;
	font-weight: bold;
	color: #fff;
}

/* game field */
canvas {
	border: 0.5rem solid #fff;
	cursor: none;
	width: 100%;
	box-shadow: 5px 10px 18px #000;
}

/* buttons hide #onScreenControllers on desktop */
#onScreenControllers {
	display: none;
}

/* mobile */
@media only screen and (max-width: 1200px) {
	#onScreenControllers {
		width: 100%;
		display: table;
		align-items: center;
	}


	canvas {
		z-index: 0;
	}

	#onScreenControllers > .glow-on-hover {
		width: 30vw;
		font-size: 10vw;
		box-shadow: 5px 10px 18px #000;
	}

	#upButton {
		float: left;
		position: fixed;
		top: 80%;
		left: 2%;
		z-index: 1;
	}

	#downButton {
		float: right;
		position: fixed;
		top: 80%;
		right: 2%;
		z-index: 1;
	}

	.info {
		display: none;
	}

	h1 {
		font-size: 5vw;
		font-family: Verdana, Helvetica, sans-serif;
		color: #fff;
	}

	#link {
		font-size: 3vw;
	}

	/* for Twitter, GitHub icon */
	.fa {
		padding-left: 10px;
		font-size: 3vw;
		margin: 5px 2px;
	}
  
	label {
		font-size: 3vw;
		font-family: Verdana, Helvetica, sans-serif;
		font-weight: bold;
		color: #fff;
	}
	  
	select {
		border-radius: 0.3vw;
		color: #8c0585b7;
		font-size: 3vw;
		font-family: Verdana, Helvetica, sans-serif;
	}

	.glow-on-hover {
		width: 17vw;
		height: auto;
	}

}