my index.html
<html>
<head>
  <title>Quizzes</title>
  <link rel='stylesheet' href='styles.css'>
</head>
<body>
  <div id='title'>Quizzes</div>
  <div class='link'><a href='quiz.html?dir=Landmarks'>Landmarks</a></div>
  <div class='link'><a href='quiz.html?dir=Movies'>Movies</a></div>
</body>
</html>
with this addition to styles.css
.link {
  font-size: 4vmin;
  padding:2vmin;
}

Only one thing remains ... the player needs a way to get back to the menu from the quiz. You should be able to do this yourself!