body {
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #000;
    overflow: hidden;
}

.game-container {
    position: relative;
}

canvas {
    display: block;
    border: 2px solid #fff;
    background-image: url('https://cdn.pixabay.com/photo/2016/08/27/11/59/pokemon-1624022_1280.jpg');
    background-size: cover;
}