body {
    margin: 0;
    padding: 0;
    background-color: #1a1a1a;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    user-select: none;
}
#game-container {
    position: relative;
    width: 300px;
    height: 400px;
    border: 2px solid #555;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}
#image-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
}
#matrix-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: grab;
}
#matrix-container:active {
    cursor: grabbing;
}
#matrix-scroll-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-repeat: repeat;
    will-change: background-position;
}