.img-fullscreen-modal {
  display: none; /* Hidden by default */
  position: fixed; /* Stay in place */
  z-index: 9999; /* Sit on top of all */
  padding-top: 100px; /* Location of the box */
  left: 0;
  top: 0;
  width: 100%; /* Full width */
  height: 100%; /* Full height */
  overflow: auto; /* Enable scroll if needed */
  background-color: rgb(0,0,0); /* Fallback color */
  background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
}

/* Modal Content (image) */
.modal-content {
  margin: auto;
  display: block;
  width: 80%;
}

/* Add Animation */
.modal-content {  
  -webkit-animation-name: zoom;
  -webkit-animation-duration: 0.6s;
  animation-name: zoom;
  animation-duration: 0.6s;
}

@-webkit-keyframes zoom {
  from {-webkit-transform:scale(0)} 
  to {-webkit-transform:scale(1)}
}

@keyframes zoom {
  from {transform:scale(0)} 
  to {transform:scale(1)}
}

/* The Close Button */
.modal-close-btn-container {
  width: 80%;
  text-align: right;
  margin: auto;
}
.modal-close-btn {
  width: 25px;
  height: 24px;
  margin-bottom: 31px;
}

.modal-close-btn:hover,
.modal-close-btn:focus {
  cursor: pointer;
}

/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 767px){
  .modal-content,
  .modal-close-btn-container {
    width: 100%;
  }
}