#testimonials-alt img:not(:first-of-type) {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

#testimonials-alt canvas {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
}