Restrict the height of an image based on the height of its adjacent sibling

How can I ensure that an image's maximum height matches its sibling's height, regardless of screen size?

The desired outcome: Equal heights - √

An undesired outcome where the image column exceeds its sibling's height (DIV - .main-content): Unequal heights - X

Note: The background-image property is not suitable for this scenario.

.container {
  display: flex;
  height: 100%;
}

.container>div {
  flex: 1;
}

.main-content {
  background: pink;
  padding: 20px;
}

.sidebar img {
  object-fit: cover;
  width: 100%;
  height: 100%;
}
<div class="container">
  <div class="main-content">
    Morbi mollis tellus ac sapien. Aenean vulputate eleifend tellus. Donec vitae orci sed dolor rutrum auctor. Cras non dolor. Vivamus quis mi. Vestibulum rutrum, mi nec elementum vehicula, eros quam gravida nisl, id fringilla neque ante vel mi. Aenean commodo
ligula eget dolor. Fusce neque. Quisque libero metus, condimentum nec, tempor a, commodo mollis, magna..
  </div>
  <div class="sidebar">
    <img src="https://placeimg.com/640/490/nature">
  </div>
</div>

csshtmlflexboxobject-fit

Answer №1

Alright, it looks like I may have stumbled upon a potential fix. One approach is to set the image's position as absolute and "stretch it" while still utilizing object-fit to maintain its cover property. If anyone has a superior solution, please don't hesitate to share.

.container {
  display: flex;
  height: 100%;
}

.container > div {
  flex: 1;
}

.main-content {
  background: pink;
  padding: 20px;
}

.sidebar img {
  object-fit: cover;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  overflow: auto;
  height: 100%;
  width: 100%;
}

.sidebar {
  position: relative;
}
<div class="container">
  <div class="main-content">
    Morbi mollis tellus ac sapien. Aenean vulputate eleifend tellus. Donec vitae orci sed dolor rutrum auctor. Cras non dolor. Vivamus quis mi.

Vestibulum rutrum, mi nec elementum vehicula, eros quam gravida nisl, id fringilla neque ante vel mi. Aenean commodo ligula eget dolor. Fusce neque. Quisque libero metus, condimentum nec, tempor a, commodo mollis, magna..
  </div>
  <div class="sidebar">
    <div><img src="https://placeimg.com/640/1000/nature"></div>
  </div>
</div>

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