body {
    display: flex;
    /* Use Flexbox layout to easily center content */
    justify-content: center;
    /* Center content horizontally (left-right) */
    margin: 0;
    /* Remove default browser margin */
    background-color: #f0f0f0;
}

canvas {
    border: 2px solid #333;
    background-color: #fff;
}

#mobile-jump-btn {
    display: none;
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.2);
    border: 2px solid rgba(0, 0, 0, 0.5);
    color: white;
    font-family: 'Raster Forge', sans-serif;
    font-size: 16px;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    z-index: 1000;
}

#mobile-jump-btn:active {
    background: rgba(0, 0, 0, 0.4);
    transform: translateX(-50%) scale(0.95);
}