main {
  margin: 5px auto;
  max-width: 450px;
  padding: 0 10px;
  color: #222;
}

form {
  font-size: 200%;
}

.centered {
  text-align: center;
}

input,
button {
  width: 100px;
}

#question {
  font-weight: bold;
}

#guessedNumberForm,
#newGameButton {
  display: none;
}

summary {
  font-weight: normal;
  text-align: center;
}