.ruimte {
  width:100%;
  aspect-ratio:.7;
  z-index:1;
  position:relative;
  overflow:hidden;
  border-radius:23px 23px 0px 23px;
  display:block;
  margin-bottom:30px; 
}

@media (max-width:991px) {
  .ruimte {
    aspect-ratio:1.56;
  }
}