.marquee {
  color : #FF0000;
  animation-name: marquee; 
  animation-timing-function: linear;
  animation-duration: 9s;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  display:inline;
}

@keyframes marquee {
0% { margin-left:0; }
50% { margin-left: 50%; }

}