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<div class="loading"></div>

body {
  background-color: #000;
  overflow-y: hidden;
}
.loading {
  height: 10em;
  width: 10em;
  margin: 100px auto;
  border: 1.1em solid rgba(255, 255, 255, 0.2);
  border-left-color: #fff;
  border-radius: 100%;
  animation: load 1.1s infinite linear;
}
@keyframes load {
  to {
    transform: rotate(1turn);
  }
}