<div class="container">
  <div class="text" data-msg="CSS&nbsp;Animation">
    <div class="text--content">
      <div class="text--data">CSS&nbsp;Animation</div>
    </div>
  </div>
</div>

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

.container {
  width: 100vw;
  min-height: 100vh;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: crimson;
}

.text {
  position: relative;
  font-size: 40px;
  text-transform: uppercase;
  letter-spacing: 3px;
  line-height: 100%;
  color: #fff;
}

.text::before {
  content: attr(data-msg);
  filter: blur(3px);
}

.text::after {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 50px;
  height: calc(100% + 4px);
  border-top: 2px solid #fff;
  border-bottom: 2px solid #fff;
  animation: moveLeft 3s linear infinite alternate;
}

.text--content {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 50px;
  overflow: hidden;
  background-color: crimson;
  animation: moveLeft 3s linear infinite alternate;
}

.text--data {
  animation: moveRight 3s linear infinite alternate;
}

@keyframes moveLeft {
  0% {
    transform: translateX(0px);
  }

  100% {
    transform: translateX(300px);
  }
}

@keyframes moveRight {
  0% {
    transform: translateX(0px);
  }

  100% {
    transform: translateX(-300px);
  }
}