@media (max-width: 70rem) {
  .testimonials {
    grid-template:
      "big-horizontal-1 big-horizontal-1 small-1" auto
      "small-2 big-horizontal-2 big-horizontal-2" auto
      "big-vertical big-vertical ." auto / 25.5rem 25.5rem 25.5rem;
  }
}

@media (max-width: 55rem) {
  .testimonials {
    grid-template:
      "big-horizontal-1 big-horizontal-1" auto
      "small-1 small-2" auto
      "big-horizontal-2 big-horizontal-2" auto
      "big-vertical big-vertical" auto / 25.5rem 25.5rem;
  }
}

@media (max-width: 35rem) {
  .testimonials {
    grid-template:
      "big-horizontal-1" auto
      "small-1" auto
      "small-2" auto
      "big-horizontal-2" auto
      "big-vertical" auto / 1fr;
  }

  .testimonial:first-child .testimonial__header {
    margin-bottom: 4rem;
  }

  .testimonial:first-child::after {
    right: 2.4rem;
  }

  .testimonial:nth-child(2) .testimonial__header {
    margin-bottom: 1.6rem;
  }

  .testimonial:nth-child(3) .testimonial__header {
    margin-bottom: 1.6rem;
  }

  .testimonial:nth-child(4) .testimonial__header {
    margin-bottom: 1.6rem;
  }

  .testimonial:last-child .testimonial__header {
    margin-bottom: 1.6rem;
  }
}