browser/libs/ui-components/blackhole/component.css

:host {
  display: block;
  position: relative;
  margin: 0;
  padding: 0;
  background-image: url('blackhole.jpg');
  background-size: cover;
  background-repeat: no-repeat;
  background-position: 50% 50%;
  height: 100%;
  width: 100%;
}

.spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  margin-left: -14px;
  margin-top: -14px;
}

.attribution {
  position: absolute;
  top: 0;
  right: 0;
  background-color: rgb(0, 0, 0);
  padding: 0.75em;
  font-size: 0.7em;
  text-decoration: none;
  font-style: normal;
  opacity: 0.3;
  color: #fafafa;
}

.attribution a {
  color: #02a8f3;
  text-decoration: none;
}