body {
	font-family: Arial, sans-serif;
	background-color: black;
	color: white;
	font-size: 16px;
	line-height: 18px;
	height: 100%;
	margin: 0 auto;
}

a, a:visited, a:hover, a:active {
	font-weight: bold;
	text-decoration: none;
	color: #558;
}

a:hover {
	font-weight: bold;
	text-decoration: none;
	color: #99c;
	border-bottom: 1px dotted #111;
}

.sprite {
	width: 32px;
	height: 32px;
	background-image: url('greenball.png');
	position: absolute;
	left: 0px;
	top: 0px;
}

#parent {
	width: 960px;
	margin: 0 auto;
}

#grid-container {
	display: grid;
	grid-template-columns: 250px 433px 250px;
	grid-template-rows: 1;
	column-gap: 20px;
	row-gap: 0px;
	background-color: black;
}

.grid-ctrl {
	width: 250px;
	padding: 0;
	margin: 0;
}

.grid-balls {
	width: 433px;
	height: 433px;
	padding: 0;
	margin: 0;
}

.slider {
	-webkit-appearance: none;
	width: 100%;
	height: 25px;
	background: #d3d3d3;
	outline: none;
	opacity: 0.7;
	-webkit-transition: .2s;
	transition: opacity .2s;
}

.slider:hover {
	opacity: 1;
}

.slider::-webkit-slider-thumb {
	-webkit-appearance: none;
	appearance: none;
	width: 25px;
	height: 25px;
	background: #4CAF50;
	cursor: pointer;
}

.slider::-moz-range-thumb {
	width: 25px;
	height: 25px;
	background: #4CAF50;
	cursor: pointer;
}

.left {
	width: 45%;
	float: left;
}

.right {
	width: 45%;
	float: right;
}

input[type=numeric] {
	width: 85%;
}

.slider-row {
	margin-bottom: 1em;
}

h1, h2 {
	text-align: center;
}

h2 {
	color: #4CAF50;
}

.footer {
	color: #bbb;
	text-align: center;
}