CSS Image Shine

I need this image to shine back and forth a few times, not on hover but all the time:

http://ift.tt/1GbonQN

.button {
    background:url(http://ift.tt/1Csa1cg);
    width:148px;
    height:166px;
    position:absolute;
    top:1px;
    left:1px;

}

Thanks