body {
    background-image: url(../billeder/pcat.jpg);  
    height: 500px;
    width: auto;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
  }


  #btext {
    position: relative;
    width: 30%;
    height: auto;

    animation-name: vink; /* vælg et andet navn til animationerne end example ;-) */
    animation-duration: 10s; /* se de mange animations-muligheder: start, stop, loop, etc. */
    animation-iteration-count: infinite;
}

  /* keyframes via procenter */

  @keyframes vink {
    0%   {
        top: 20px;
        left: 925px;
    } 
    25%  {
        top: 20px;
        left: 925px;
        rotate: 10deg;
    }
    50%  {
        top: 20px;
        left: 925px;
    }
    75%  {
        top: 20px;
        left: 925px;
        rotate: -10deg;
    }
    100% {
        top: 20px;
        left: 925px;
    }
  }