body {
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: #000;
    font-family: 'Press Start 2P', cursive;
}

.game-container {
    position: relative;
    width: 800px;
    height: 600px;
    border: 2px solid #0f0;
    box-shadow: 0 0 20px #0f0;
}

canvas {
    display: block;
    background: #111;
}