body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #111;
}

#game-container {
    position: relative;
    overflow: hidden;
}

#game-container::after {
    content: " ";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.15) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.04), rgba(0, 255, 0, 0.01), rgba(0, 0, 118, 0.04));
    z-index: 5;
    background-size: 100% 4px, 3px 100%;
    pointer-events: none;
}

#game-container::before {
    content: " ";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: radial-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.3) 100%);
    z-index: 6;
    pointer-events: none;
}

canvas {
    background-color: #000;
    border: 2px solid #fff;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    display: block;
}