img.thumb {
  transition: .2s;
}
img.thumb:hover{
  cursor: pointer;
  transform: scale(1.1);
}
.modal {
  display: none;
  position: fixed;
  z-index: 1;
  padding-top: 35px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.9);
}
.modal-content {
  margin: auto;
  display: block;
  max-width: 90%;
  max-height: 90%;
}
div.buttons {
  text-align: center;
}
.button {
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
}
span.button:hover, span.button:focus {
  user-select: none;
  color: #bbb;
  text-decoration: none;
  cursor: pointer;
}
span#next {
  top: 15px;
  display: inline;
}
span#close {
  top: 15px;
  display: inline;
}
span#prev {
  top: 15px;
  display: inline;
}