.card {
  transition: box-shadow 0.3s ease;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

.card:hover {
  box-shadow: 0 0 15px 3px #6c757d !important; /* green shadow */
}

.card-img-top {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-top-left-radius: calc(.25rem - 1px);
  border-top-right-radius: calc(.25rem - 1px);
}