body {
    margin: 0;
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
    background-color: black;
    user-select: none;
}

#video {
    position: fixed;
    top: 0;
    left: 0;
    min-width: 100%;
    min-height: 100%;
    margin: 0 auto;
    z-index: -1;
    filter: contrast(10) grayscale(1);
}

.ball {
    cursor: grab;
    cursor: -webkit-grab;
}

.ball:active {
    cursor: grabbing;
    cursor: -webkit-grabbing;
}