html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
}

.carousel-inner {
    height: 0;
    padding-bottom: 100%; /* 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: contain; /* or 'contain' if you want stretch instead of crop */
    }