.residential-photo {
  max-width: 300px;
}

.carousel-inner {
  height: 0;
  padding-bottom: 50%; /* this sets carousel aspect ratio (4:1 here) */
}

.carousel-item {
  position: absolute !important; /* Bootstrap is insistent */
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.carousel-item img {
  height: 100%; /* Bootstrap handles width already */
  object-fit: cover; /* or 'contain' if you want stretch instead of crop */
}