div#playground-content {
	font-family: Arial, Helvetica, sans-serif;
	background-color: #f6f6f6;
	position: relative;
	margin: 20px auto;
}

div#playground-graphic {
	background-color: #e6e6e6;
	position: relative;
	margin: 0 auto;
	height: 250px;
	width: 100%;
}

div#header {
	height: 30px;
	text-align: center;
}

div#header h2 {
	font-size: 1.2em;
	line-height: 30px;
}

div#playground-graphic canvas {
	background-color: #8890a5;
}

.button-labels {
	position: absolute;
	top: 113px;
	margin-left: -2px;
}

div#playground-controls {
	max-width: 600px;
	display: flex;
	flex-wrap: nowrap;
	justify-content: space-around;
	position: relative;
	font-size: 1.0em;
	height: 133px;
	padding-top: 10px;
}

div#button-group {
	display: flex;
	flex-direction: column;
	justify-content: flex-start;
}

div#button-group button {
	width: 70px;
	margin: 5px 0;
	flex-shrink: 2;
}

div.checkbox-group {
	width: 100px;
	height: 100px;
	display: grid;
	grid-template-columns: 1fr 1fr 1fr;
	gap: 20px;
	flex-shrink: 2;	
}

div#radios {
	flex-shrink: 1;	
}

@media screen and (width >= 940px) {

	div#playground-graphic {
		width: 900px;
	}

	div#playground-content {
		width: 900px;
	}
}

@media screen and (width < 940px) {
	div#playground-content {
		width: 100%;
	}

	div#playground-graphic {
		width: 100%;
	}
}