JSFiddle - React, Tailwind, and code Playground

HTML

<header class="page-head">

  <div class="page-head__ticker">
    <p class="msg"><span>Free Shipping on orders over $50</span></p>
    <p class="msg msg--two"><span>Free Shipping on orders over $50</span></p>
  </div>

</header>

CSS

body {
  background: red;
}

.page-head {
  background: white;
  box-sizing: border-box;
  padding: 0;
  position: fixed;
  top: 0;
  width: 375px;
}

/**
 * Ticker
 */

.page-head__ticker {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Arial";
  font-size: 11px;
  font-weight: Bold;
  height: 36px;
  line-height: 1;
  padding: 0 12px;
  text-transform: uppercase;
}

.msg {
  margin: 0 auto;
  white-space: nowrap;
  overflow: hidden;
  position: absolute;
}

.msg span {
  animation: marquee 6s linear infinite;
  display: inline-block;
  padding-left: calc(100% + 24px);
}

.msg--two span {
  animation-delay: 3s;
}

@keyframes marquee {
  0% {
    transform: translate(0, 0);
  }

  100% {
    transform: translate(-100%, 0);
  }
}