body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
  overflow: hidden;
}

.book-title {
  font-size: 48px;
  margin-bottom: 20px;
}

button {
  font-size: 48px;
  padding: 40px;
  margin: 20px;
  width: 90%;
  max-width: 400px;
}

#progressBar {
  width: 90%;
  max-width: 400px;
  height: 20px;
  margin: 20px;
}

#timeDisplay {
  font-size: 24px;
  margin-bottom: 20px;
}