index.css

* {
  box-sizing: border-box;
}

body {
  font-family: 'Lato', sans-serif;
}

h1, h2 {
  margin: 0;
}

h2 {
  font-size: 24px;
}

button {
  display: block;
  margin: auto;
  margin-top: 15px;
  margin-bottom: 15px;
  Font-Size: 18px;
  background-color: gainsboro;
  border-radius: 3px;
  padding: 5px;
}

input[type="radio"] {
  display: inline-block;
  margin-left: 15px;
  padding-right: 5px;
}

fieldset {
  border: none;
}

.mainTitle {
  background-color: gainsboro;
  text-align: center;
  padding: 20px;
  Font-Size: 20px;
}

.Sierpinski {
  width: 125px;
}

.startPage, .question, .status, .feedback {
  margin: auto;
  padding: 10px;
  text-align: center;
  Font-Size: 18px;
}

.question {
  max-width: 600px;
  height: 275px;
  margin-top: 10px;
  margin-bottom: 10px;
  border: none;
}

.status, .question {
  display: none;
  vertical-align: middle;
}

.status {
  background-color: gainsboro;
  text-align: center;
  height: 130px;
}

.feedback {
  font-weight: bold;
  font-size: 20px;
}

.feedbackContainer {
  height: 60px;
}

.startOver {
  display: none;
}