Change the dimensions of a picture from 4:3 to 16:9 while maintaining its responsiveness using CSS

Imagine I have this image with a 4:3 aspect ratio and dimensions of 640x480:

https://i.sstatic.net/p4xRM.jpg

Here is the code used to display it:

<img src="../static/images/image4-3.jpg" class="img-fluid" alt="">

Now, I want to display it in its real aspect ratio of 16:9 (dimensions are 640x360):

https://i.sstatic.net/p1rd9.jpg

The calculation shows that for 16/9=1.77777777778 => 640/1.77777777778 = 360. Setting a style with "height: 360px" and "width: 100%" works, but it's not responsive. Is there a way to dynamically adjust the height of an image while maintaining responsiveness using bootstrap?

Just starting out with CSS, so forgive me if this is a basic question.

htmlcssbootstrap-5

Answer №1

If you want to maintain a specific ratio for your elements in Bootstrap, the framework provides built-in helpers that make it easy to achieve this while keeping things responsive. Here's how you can do it:

  1. Enclose your image within a div
  2. Add the classes ratio ratio-16x9 to the div. These classes will create a responsive container with a 16:9 aspect ratio.
  3. Apply the img-fluid class to the image for it to scale nicely within its container.

<link href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e0828f8f949394928190a0d5ced0ced2">[email protected]</a>/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">

<!-- note the "ratio ratio-16x9" classes on the parent div -->

<!-- resize the screen to see how the image nicely scales while maintaining the desired ratio -->

<!-- for demo purpose, am setting the width of the wrapper div to 75% so that the ratio effect can be easily seen -->
<div class="ratio ratio-16x9 w-75 m-auto">
  <img src="https://i.sstatic.net/p4xRM.jpg" class="img-fluid">
</div>

Explore more about Bootsrap 5 Ratio Helpers in the BS5 documentation.

Additionally, there is a native way to implement ratios using the aspect-ratio rule, but as of now, it lacks good browser support.

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