.isotope-item {
  z-index: 2;
}
.isotope-hidden.isotope-item {
  pointer-events: none;
  z-index: 1;
}
.isotope,
.isotope .isotope-item {
  /* change duration value to whatever you like */

  -webkit-transition-duration: 0.8s;
  -moz-transition-duration: 0.8s;
  transition-duration: 0.8s;
}
.isotope {
  -webkit-transition-property: height, width;
  -moz-transition-property: height, width;
  transition-property: height, width;
}
.isotope .isotope-item {
  -webkit-transition-property: -webkit-transform, opacity;
  -moz-transition-property: -moz-transform, opacity;
  transition-property: transform, opacity;
}