.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;
}