.custom-notice-bar {
  width: 100%;
  overflow: hidden;
  background: #222;
  color: #fff;
  font-size: 16px;
  padding: 10px 0;
  position: relative;
  white-space: nowrap;
}

.notice-track {
  display: inline-block;
  padding-left: 100%;
  animation: scroll-left 20s linear infinite;
}

.notice-track span {
  margin-right: 50px;
}

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