.announcement-bar__message {
  display: inline-block;
  white-space: nowrap;
  animation: scroll-left 20s linear infinite;
  padding-left: 100%;
}

@keyframes scroll-left {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-100%); }
}

.announcement-bar {
  overflow: hidden;
}