如何保持高度为100％的缩放图像的长宽比？

Question

这不适用于维持缩放图像的宽高比

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

.gwd-page-container {
  position: relative;
  width: 100%;
  height: 100%;
}

.gwd-page-wrapper {
  background-color: rgb(255, 255, 255);
  position: absolute;
  transform: translateZ(0px);
}

.gwd-page-size {
  width: 100%;
  height: 100%;
}

.gwd-image-55hk {
  width: auto;
  /* not sure how it will work nicely */
  height: 100%;
}