.canvas-box {
    position: absolute;
    left: 3%;
    z-index: -2;
    top: 1%;
    opacity: .3;
    width: 100%;
    max-width: 40rem;
    height: 30rem;
    margin: 0 auto 25px;
    overflow: hidden;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}