body {
	font-family: sans-serif;
	margin: 0px;
}

div#question {
	font-weight: bold;
	margin-bottom: 10px;
	font-size: 20px;
	margin: 5px;
	max-width: 600px;
}

div#show {
	margin: 5px;
}
div#next {
	margin: 5px;
}

div#answer {
	max-width: 600px;
	white-space: pre-wrap;
	font-size: 16px;
	display: none;
	margin: 5px;

}

nav ul {
	list-style-type: none;
  	margin: 0;
  	padding: 0;
  overflow: hidden;
  background-color: #333;
}

nav li {
	float: left;

}

nav li a {
display: block;
  color: white;
  text-align: center;
  padding: 4px 6px;
  text-decoration: none;
	font-size: 10px;
}

nav li a:hover {
background-color: #000;
}

nav li a#sel {
background-color: #4CAF50;
}