.marquee {
  overflow: hidden;
  white-space: nowrap;
}
.marquee:hover .track {
  animation-play-state: paused;
}

.track {
  display: inline-block;
  animation: marquee 15s linear infinite;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}