html {
  height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  display: flex;
	align-items: center;
  margin: 0;
  min-height: 100%;
  background: #ddd;
}

memory-game {
  --memory-game-cards-per-line: 6;
  width: 90%;
  margin: auto;
}