body {
  margin: 0;
  padding: 0;
}

h1 {
  text-align: center;
  font-size: 3em;
  margin: 2px 0;
}

.mainDiv {
  display: flex;
  justify-content: space-around;
  max-width: 600px;
  margin: 0 auto;
  flex-wrap: wrap;
  margin-top: 50px;
}

.mainDiv img:hover {
  background-color: lightblue;
}

.resultsDiv {
  text-align: center;
  margin-top: 25px;
}

.hidden {
  visibility: hidden;
}

#playAgain {
  border-radius: 20px;
  font-size: 1.3em;
  padding: 15px;
  font-weight: bold;
  background-color: lightblue;
}

#playAgain:hover {
  background-color: black;
  color: #ddd;
}