h1 {
	font-size: 7vw;
}
body {
	text-align: center;
	user-select: none; /* supported by Chrome and Opera */
	-webkit-user-select: none; /* Safari */
	-khtml-user-select: none; /* Konqueror HTML */
	-moz-user-select: none; /* Firefox */
	-ms-user-select: none; /* Internet Explorer/Edge */
}
table {
	margin-left: auto;
	margin-right: auto;
}
button {
	height: 23vw;
	width: 23vw;
	font-size: 7vw;
	background-color: purple;
	color: black;
	padding: 0;                   /* to allow iPhone to center text in button */
	touch-action: manipulation;   /* to disable double-tab zoom on buttons */
}
label {
	height: 10vw;
	font-size: 7vw;
}
#answer {
	display: inline-block;
	width: 20vw;
	border-style: solid;
	border-width: 1px;
	padding-top: 9px;           /* to allow iphone to center text in button */
	touch-action: manipulation; /* to disable double tap zoom on buttons */
}