.form-checkbox-item:active {
    animation : animationFrames ease 1s;
    animation-iteration-count : 1;
    transform-origin : 50% 50%;
    animation-fill-mode : forwards;
    /*when the spec is finished*/
  -webkit-animation : animationFrames ease 1s;
    -webkit-animation-iteration-count : 1;
    -webkit-transform-origin : 50% 50%;
    -webkit-animation-fill-mode : forwards;
    /*Chrome 16+, Safari 4+*/ 
  -moz-animation : animationFrames ease 1s;
    -moz-animation-iteration-count : 1;
    -moz-transform-origin : 50% 50%;
    -moz-animation-fill-mode : forwards;
    /*FF 5+*/
  -o-animation : animationFrames ease 1s;
    -o-animation-iteration-count : 1;
    -o-transform-origin : 50% 50%;
    -o-animation-fill-mode : forwards;
    /*Not implemented yet*/
  -ms-animation : animationFrames ease 1s;
    -ms-animation-iteration-count : 1;
    -ms-transform-origin : 50% 50%;
    -ms-animation-fill-mode : forwards;
    /*IE 10+*/;
}

@keyframes animationFrames{
  0% {
    opacity:0;
    transform:  translate(0px,-25px)  ;
  }
  100% {
    opacity:1;
    transform:  translate(0px,0px)  ;
  }
}

@-moz-keyframes animationFrames{
  0% {
    opacity:0;
    -moz-transform:  translate(0px,-25px)  ;
  }
  100% {
    opacity:1;
    -moz-transform:  translate(0px,0px)  ;
  }
}

@-webkit-keyframes animationFrames {
  0% {
    opacity:0;
    -webkit-transform:  translate(0px,-25px)  ;
  }
  100% {
    opacity:1;
    -webkit-transform:  translate(0px,0px)  ;
  }
}

@-o-keyframes animationFrames {
  0% {
    opacity:0;
    -o-transform:  translate(0px,-25px)  ;
  }
  100% {
    opacity:1;
    -o-transform:  translate(0px,0px)  ;
  }
}