CodePen Embed - Aspect Ratio in Flexbox Broken (stretching)

<div class="shapes">
  <div>1 / 1</div>
  <div>3 / 2</div>
  <div>1 / 2</div>
</div>

.shapes {
  display: flex;
  gap: 2rem;
  
  div {
    background: red;
    color: white;
    width: 100px;
    place-items: center;
    display: grid;
  }
  
  div:nth-child(1) {
    aspect-ratio: 1 / 1;
  }
  div:nth-child(2) {
    aspect-ratio: 3 / 2;
  };
  div:nth-child(3) {
    aspect-ratio: 1 / 2;
  }
}

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