CodePen Embed - day 2 - transform

<div class="parent position">
  <div></div>
</div>

.parent {
  border: black solid 3px;
  width: 20vw;
  aspect-ratio: 1;
  position: relative;

  div {
    border: red solid 2px;
    width: 5vw;
    aspect-ratio: 1;
    background-color: red;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
}

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