.marquee {
  overflow: hidden;
  white-space: nowrap;
  color : green;
  background-color : yellow;
  border-width : 1px 1px 1px 1px;
  height: 25px;
}
.marquee span {
  display: inline-block;
  animation: marquee 20s linear infinite;
}
@keyframes marquee {
  0% { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}