På hover element

-moz-animation-name: easeIn;
-moz-animation-iteration-count: 1;
-moz-animation-timing-function: ease-in;
-moz-animation-duration: 0.3s;
-webkit-animation-name: easeIn;
-webkit-animation-iteration-count: 1;
-webkit-animation-timing-function: ease-in;
-webkit-animation-duration: 0.3s;
animation-name: easeIn;
animation-iteration-count: 1;
animation-timing-function: ease-in;
animation-duration: 0.3s;

Tilføjes css

@-moz-keyframes easeIn {
    0% {
        opacity: 0.0;
        filter: alpha(opacity=0);}
    100% {
        opacity: 1.0;
        filter: alpha(opacity=1);}
}
@-webkit-keyframes easeIn {
    0% {
        opacity: 0.0;
        filter: alpha(opacity=0);}
    100% {
        opacity: 1.0;
        filter: alpha(opacity=1);
    }
}
@keyframes easeIn {
    0% {
        opacity: 0.0;
        filter: alpha(opacity=0);}
    100% {
        opacity: 1.0;
        filter: alpha(opacity=1);}
}