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;
}