[рони]

<style>
div{
    position: relative;
    top: 150px;
    left: 200px;
    width: 100px;
    height: 100px;
    background: #FFFF00;
    color: #3333FF;
    -webkit-animation: test 2s infinite forwards;
    animation: test 2s infinite forwards;
}

@-webkit-keyframes test{
    100%{
       filter: alpha(opacity=20);
opacity: 0.2;
-webkit-transform: scale(3);
-moz-transform: scale(3);
-o-transform: scale(3);
-ms-transform: scale(3);
transform: scale(3);

    }
}
@keyframes test{
 100%{
 filter: alpha(opacity=20);
opacity: 0.2;
-webkit-transform: scale(3);
-moz-transform: scale(3);
-o-transform: scale(3);
-ms-transform: scale(3);
transform: scale(3);

    }
}
</style>
<div>
  test
</div>