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

.loader {
  width: fit-content;
  font-weight: bold;
  font-family: monospace;
  font-size: 30px;
  background: linear-gradient(90deg, #000 50%, #0000 0) right / 200% 100%;
  animation: loading 2s infinite linear;
}

.loader::before {
  content: "Loading...";
  color: #0000;
  padding: 0 5px;
  background: inherit;
  background-image: linear-gradient(90deg, #fff 50%, #000 0);
  background-clip: text;
}

@keyframes loading {
  100% {
    background-position: left;
  }
}