.slider {
  position: relative;
  overflow: hidden;
  height: 600px;
}
.slider > * {
  opacity: 0; 
  z-index: 0;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 600px;
/*  object-fit: cover; */
}

.current {
  opacity: 1;
  z-index: 2;
}


.previous {
/*  z-index: 3; deze opdracht verstoort de synchroniciteit tussen afbeelding en hyperlink */
  transition-property: opacity;
  transition-duration: 1s;
  transition-timing-function: ease;
}