.options .answer {
	font-weight: bold;
}
.book {
	padding: 20px;
	font-family: arial;
}
.book .heading {
	text-align: center;
	border: 1px solid #000;
	padding: 10px;
	border-radius: 10px;
	font-size: medium;
}
.pages .page {
	display: none;
}
.pages .page.show {
	display: block;
}
.controls {
	display: flex;
}
.controls .button {
	width: 100%;
	background-color: #373;
	color: #fff;
	text-align: center;
	font-family: arial;
	font-size: 20px;
	padding: 10px;
	margin: 10px;
	border-radius: 10px;
}
.controls .button:hover {
	background-color: #fff;
	color: #373;
	border: 2px solid #373;
	cursor: pointer;
}