CodePen Embed - ZEVRjmY

<p>元画像</p>  
<figure><img src="https://www.eyesofc.co.jp/webeyes/assets/img/common/sample01.jpg" alt="サンプル画像"></figure>
  <figure><img src="https://www.eyesofc.co.jp/webeyes/assets/img/common/sample03.jpg" alt="サンプル画像"></figure>

<p>比率を同じに設定</p>
  <figure class="img"><img src="https://www.eyesofc.co.jp/webeyes/assets/img/common/sample01.jpg" alt="サンプル画像"></figure>
  <figure class="img"><img src="https://www.eyesofc.co.jp/webeyes/assets/img/common/sample03.jpg" alt="サンプル画像"></figure>

img {
  max-width: 100%;
  height: auto;
}

.img {
  aspect-ratio: 4 / 3;
}
.img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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