css3 animation

#ayr_banner a { display:inline-block; width:49%; height:90%; border: 1px solid red; background: #fff; opacity: 0; animation:mymove 2s infinite;}

@keyframes mymove
{
25%
  {
    opacity: 0.5;
  }
50%
  {
    opacity: 0.1;
  }
75%
  {
    opacity: 0.5;
  }
100%
  {
    opacity: 0.1;
  }
}