.circle, .squircle {
  border-top: 0.1em solid rgba(255,255,255,0.4);
  height: 12.5em;
  position: absolute;
  width: 12.5em;
}

.circle {
  border-radius: 50%;
  box-shadow: 0 1em 2em rgba(0,0,0,0.5);
  left: calc(50% - 6.25em);
  top: calc(50% - 12.5em);
  transform-origin: 50% 12.5em;
}