How Can I Maintain Aspect Ratio in a Div Element While Auto-Resizing for Different Window Sizes?

Maintaining Aspect Ratio for Auto-Resizing Div Elements in Varying Window Sizes

In web development, it's often desirable to have a central div that maintains a specific aspect ratio while adapting to changes in the window size. However, finding a solution that works effectively for both width and height adjustments can be challenging.

Current Approach

The provided CSS and HTML code create a centered div that maintains a fixed size. When the window size becomes smaller, the div shrinks but not in a way that preserves its original aspect ratio.

Solution Using aspect-ratio Property

To address this issue, you can utilize the aspect-ratio property. This property is now widely supported and allows you to specify a fixed ratio for an element's dimensions.

<br>body {<br>  height: 100vh;<br>  margin: 0;<br>  display: flex;<br>  justify-content: center;<br>  align-items: center;<br>  background: gray;<br>}</p>
<p>.stage {<br>  --r: 960 / 540;</p>
<p>aspect-ratio: var(--r);<br>  width:min(90%, min(960px, 90vh*(var(--r))));</p>
<p>display: flex;<br>  justify-content: center;<br>  align-items: center;</p>
<p>background:</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">/* this gradient is a proof that the ratio is maintained since the angle is fixed */
linear-gradient(30deg,red 50%,transparent 50%),
chocolate;

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}

1. Calcualte Aspect Ratio: The --r variable stores the aspect ratio calculated as the width / height of the desired size (960 / 540).
2. Set Aspect Ratio: The aspect-ratio property sets the aspect ratio to the calculated value. This ensures that the element always maintains that ratio.
3. Calculate Width: The width property is set using a min() function that considers the original width, 90% of the available window width, and 90vh times the calculated aspect ratio. This formula ensures that the element shrinks to fit the window while maintaining its aspect ratio.
4. Center and Style the Div: The div is centered using flexbox, and its background is styled with a gradient to demonstrate that the aspect ratio is maintained even when the element shrinks.

This solution effectively ensures that the div element preserves its aspect ratio while adapting to different window sizes, both in width and height.

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