.elementor-thumbnails-swiper .swiper-slide > a {
      display: block;
      border: 2px solid #D4D4D4;
      border-radius: 5px;
      overflow: hidden;
      cursor: pointer;
      transition: border-color .15s ease-in-out;
  }

  .elementor-thumbnails-swiper .swiper-slide > a:hover {
      border-color: #D4D4D4;             /* o un tono más oscuro si quieres feedback de hover */
  }

  .elementor-thumbnails-swiper .swiper-slide-thumb-active > a,
  .elementor-thumbnails-swiper .swiper-slide-thumb-active > a:hover {
      border-color: var(--color-blue);
  }