swiper/components/lazy/lazy.scss

/* Preloader */
:root {
  /*
  --swiper-preloader-color: var(--swiper-theme-color);
  */
}
.swiper-lazy-preloader {
  width: 42px;
  height: 42px;
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -21px;
  margin-top: -21px;
  z-index: 10;
  transform-origin: 50%;
  animation: swiper-preloader-spin 1s infinite linear;
  box-sizing: border-box;
  border: 4px solid var(--swiper-preloader-color, var(--swiper-theme-color));
  border-radius: 50%;
  border-top-color: transparent;
}

.swiper-lazy-preloader-white {
  --swiper-preloader-color: #fff;
}
.swiper-lazy-preloader-black {
  --swiper-preloader-color: #000;
}
@keyframes swiper-preloader-spin {
  100% {
    transform: rotate(360deg);
  }
}