#mySlider {
  position: relative;
  width: 100%;
   padding-top: calc(9 / 13 * 100%);
  overflow: hidden;
}

#mySlider > div {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}

#mySlider > div.active {
  opacity: 1;
}

#mySlider > div img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#prevButton,
#nextButton {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  padding: 10px 20px;
  background-color: #f1f1f1;
  border: none;
  font-size: 20px;
  cursor: pointer;
}

#prevButton:hover,
#nextButton:hover {
  background-color: #ddd;
}

#prevButton {
  left: 20px;
}

#nextButton {
  right: 20px;
}