.close {
  font-size: 1.5rem;
}

.col-12 img {
  opacity: 0.7;
  cursor: pointer;
  margin: 2rem;
  width: 100%;
}

.col-12 img:hover {
  opacity: 1;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}