* {
  box-sizing: border-box;
}

.wrapper {
  font-family: Helvetica, sans-serif;
  max-width: 960px;
  margin: 0 auto;
  height: 90vh;
}

.title {
  font-weight: 300;
  text-align: center;
  margin-top: 80px;
}

.results {
  width: 100px;
  height: 100px;
  margin: 50px auto;
  font-size: 3rem;
  text-align: center;
  text-shadow: 0px 0px 40px green;
}

.tileScreen {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 450px;
  margin: 0 auto 0 auto;
}

.tileContainer {
  border: 1px solid #000;
  background-color: grey;
  cursor: pointer;
  padding: 5px;
  margin: 5px;
  user-select: none;
}

.tileContainer:hover {
  border: 1px solid gold;
}

.tile {
  font-size: 3rem;
}

.tileHide {
  opacity: 0;
}

.tileVisible {
  opacity: 1;
}

.matched {
  background-color: greenyellow;
}

.playerClicks {
  font-size: 2rem;
  margin-top: 40px;
  text-align: center;
  font-weight: 300;
}

.winner {
  max-width: 300px;
  max-height: 300px;
  font-size: 2.5rem;
  text-align: center;
  padding: 2rem;
  z-index: 10000;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: lightgreen;
  cursor: pointer;
}
<script src=".././js/main.bundle.js"></script>