.shiner {
    position: relative;
    background: linear-gradient(15deg,rgba(255,255,255,0) 0,rgba(255,255,255,.1) 35%,rgba(255,255,255,.2) 55%,rgba(255,255,255,.1) 75%,rgba(255,255,255,0) 100%);
    animation: myfirst 0.8s linear 0s infinite;
    width: 60px;
    height: 25px;
    left: -30px;
}

@keyframes myfirst {
      0%   { top:32px;}
      25%  { top:16px;}
      50%  { top:0px;}
      75%  { top:-16px;}
      100% { top:-32px;}
}