#main, #thumbnails img {
  box-shadow: 0px 0px 4px 0px #b8b8b8;
  border-radius: 10px;
}

* {
  transition: all 0.5s ease;
}
#thumbnails {
  text-align: center;
}
#thumbnails img {
  width: 100px;
  height: 100px;
  margin: 10px;
  cursor: pointer;
}
@media only screen and (max-width: 480px) {
  #thumbnails img {
    width: 50px;
    height: 50px;
  }
}
#thumbnails img:hover {
  transform: scale(1.15);
}

#main {
  width: 99%;
  height: auto;
  object-fit: cover;
  display: block;
  margin: 20px auto;
}
@media only screen and (max-width: 480px) {
  #main {
    width: 100%;
  }
}

.hidden {
  opacity: 0;
}