body {
  height: 100vh;
  overflow: hidden;
  display: grid;
  place-items: center;
}

.loader {
  --color: #000;
  width: fit-content;
  font-weight: bold;
  font-family: monospace;
  font-size: 30px;
  color: #0000;
  overflow: hidden;
  text-shadow: 0 0 var(--color), 11ch 0 var(--color);
  animation: loading 2s infinite linear;
}

.loader::before {
  content: "Loading...";
}

@keyframes loading {
  to {
    text-shadow: -11ch 0 var(--color), 0ch 0 var(--color);
  }
}