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How Can I Preserve Aspect Ratio in Auto-Resizing Div Elements Using CSS?
How Can I Preserve Aspect Ratio in Auto-Resizing Div Elements Using CSS?
Nov 20, 2024 am 01:49 AM
Preserving Aspect Ratio in Auto-Resizing Div Elements
Div elements can be challenging to style when they need to fit varying screen sizes while maintaining a specific aspect ratio. This can be achieved using the aspect-ratio CSS property alongside an intuitive combination of width and height attributes.
To gracefully handle both width and height changes, you can leverage the aspect ratio calculation --r = width / height. Here's how to implement it in CSS:
body {
height: 100vh;
margin: 0;
display: flex;
justify-content: center;
align-items: center;
background: gray;
}
.stage {
--r: 960 / 540;
aspect-ratio: var(--r);
width: min(90%, min(960px, 90vh * var(--r)));
display: flex;
justify-content: center;
align-items: center;
background:
linear-gradient(30deg, red 50%, transparent 50%),
chocolate;
}
In this example:
- --r is a custom CSS variable that stores the aspect ratio as a decimal.
- The aspect-ratio property sets the calculated aspect ratio.
- The width property calculates the minimum value between 90% of the available space, 960px, and 90% of the viewport height multiplied by the aspect ratio. This ensures the width remains proportionate to the height.
- The height is determined by the aspect-ratio property in conjunction with the calculated width.
Such an approach ensures that the div element automatically resizes while maintaining the desired aspect ratio, accommodating both width and height variations.
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