.falling {
    width: 100%;
    height: 100%;
    position: relative;
z-index: 0;
    background-size: cover;
    background-position: center center;
    margin: 10px 0 20px 0;
}
.falling canvas {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    mix-blend-mode: color-dodge;
}