/* === GŁÓWNY BLOK SLIDERA === */
#topSlider {
  width: 216px;
  height: 216px;
  margin: 0 auto;
  border: 10px solid rgb(224, 224, 215);
  overflow: hidden;
  position: relative;      /* kluczowe */
  background: #f7fbff;
}

#topSlider .slider-item {
  position: absolute;      /* kluczowe */
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

#topSlider .slider-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}


/* === RESPONSYWNOŚĆ === */
@media (max-width: 600px) {
  #topSlider {
    width: 90vw;
    height: 90vw;
    max-width: 216px;
    max-height: 216px;
  }
}