* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;

    background-image: url('images/big.png');
    background-repeat: no-repeat;
    background-size: 40%;
    background-position: bottom right;
}

.tictactoe {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    display: grid;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#game {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
}