"CSS Tip: Ensuring the width dynamically adjusts to match the height

Seeking a CSS-only approach to solve this particular issue.

In need of creating a square with x% height relative to its parent element.

This requires the width to be equal to the height.

Hitherto, my search has only yielded JavaScript-based solutions.

.parent{
    height: 60vh;
}

.square{
    height: 90%;
    width: (equal to height)
}

Answer №1

To achieve this particular effect, a somewhat unconventional method must be employed.

The solution involves adding an additional child element to the existing child element, which should be an image with an intrinsic ratio.

By using a square image, the resulting child element will also take on a square shape.

Although the image itself may not be visible, its presence is essential, so setting the opacity to 0 effectively hides it from view.

.father {
  height: 300px;
  width: 300px;
  border: solid 1px black;
}

.child {
  border: solid 1px blue;
  background-color: lightblue;
  height: 90%;
  width: fit-content;
}

.child img {
  height: 100%;
  opacity: 0;
}
<div class="father">
  <div class="child">
     <img src="https://i.sstatic.net/04i18.png">
  </div>
</div>

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