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

.loader {
  width: fit-content;
  font-weight: bold;
  font-family: monospace;
  font-size: 30px;
  background: radial-gradient(circle closest-side, #000 94%, #0000)
    right/calc(200% - 1em) 100%;
  animation: loading 1s infinite alternate linear;
}

.loader::before {
  content: "Loading";
  line-height: 1em;
  color: #0000;
  background: inherit;
  background-image: radial-gradient(circle closest-side, #fff 94%, #000);
  background-clip: text;
}

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