How to perfectly center an element with a specified aspect ratio

I am experiencing a strange problem when attempting to center an element with aspect-ratio applied. I thought it would work similar to centering an image, but I keep getting stuck with an element of 0px x 0px.

https://codepen.io/richardcool/pen/xxeKOwp

I have set up a simple CodePen demo to illustrate the issue. When I remove the align-items: center line, the element turns into 0px x 0px. I have also experimented with centering using absolute positions, but encountered the same problem.

Any suggestions or thoughts on how to solve this?

htmlcssaspect-ratio

Answer №1

To ensure proper alignment and sizing with the aspect-ratio property, it is essential to define explicit dimensions for your div element. Without specific width or height values, the layout may not render as intended. Consider the following scenario:

<div class="gallery">
  <div class="thumbnail"></div>
</div>

.gallery {
  width: 50vw;
  background-color: blue;
  display: flex;
  justify-content: center;
  align-items: center;
}
.thumbnail {
    aspect-ratio: 4 / 3;
    background-color: green;
    max-height: 70%;
    max-width: 70%;
    height: 70%;
}

Answer №2

When using alignment properties like flex with aspect ratio, it's crucial to define an actual width or height on the element. Without a base value for CSS to calculate from, even specifying max-width won't work properly.

To ensure proper alignment and centering, set the width of the poster div to 100%. Any max-width settings will take precedence, allowing you to vertically center it using align-items: center on the parent element.

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