safari fixed bug

safari iframe下fixe无法显示

-webkit-animation: safariFixedBug 0 linear 0.1s;
   -webkit-animation-fill-mode: forwards;
   -webkit-animation-iteration-count: 1;

@-webkit-keyframes safariFixedBug {
    0% {
    top:0;
    }

    100% {
      top:1px
    }
}