// Use Bootstrap breakpoints for consistency.
$bootstrap-sm: 576px;
$bootstrap-md: 768px;
$bootstrap-lg: 992px;
$bootstrap-xl: 1200px;

// Crop thumbnail images.
#gallery {
  img {
    height: 75vw;
    object-fit: cover;
    
    @media (min-width: $bootstrap-sm) {
      height: 35vw;
    }
    
    @media (min-width: $bootstrap-lg) {
      height: 18vw;
    }
  }
}
// Crop images in the coursel
.carousel-item {
  img {
    height: 60vw;
    object-fit: cover;
    
    @media (min-width: $bootstrap-sm) {
      height: 350px;
    }
  }
}