Documentation and examples for opting images into responsive behavior (so they never become wider than their parent) and add lightweight styles to them—all via classes.

Responsive images

Images in Boosted are made responsive with .img-fluid. This applies max-width: 100%; and height: auto; to the image so that it scales with the parent width.

PlaceholderResponsive image
<img src="..." class="img-fluid" alt="...">
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Image thumbnails

In addition to our border-radius utilities, you can use .img-thumbnail to give an image a 2px border appearance.

A generic square placeholder image with a gray border around it200x200
<img src="..." class="img-thumbnail" alt="...">
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Aligning images

Align images with the helper float classes or text alignment classes. block-level images can be centered using the .mx-auto margin utility class.

Placeholder200x200 Placeholder200x200
<img src="..." class="float-start" alt="...">
<img src="..." class="float-end" alt="...">
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Placeholder200x200
<img src="..." class="mx-auto d-block" alt="...">
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Placeholder200x200
<div class="text-center">
  <img src="..." alt="...">
</div>
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Picture

If you are using the <picture> element to specify multiple <source> elements for a specific <img>, make sure to add the .img-* classes to the <img> and not to the <picture> tag.

<picture>
  <source srcset="..." type="image/svg+xml">
  <img src="..." class="img-fluid img-thumbnail" alt="...">
</picture>

CSS

Sass variables

Variables are available for image thumbnails.

$thumbnail-padding:                 0; // Boosted mod
$thumbnail-bg:                      var(--#{$prefix}body-bg);
$thumbnail-border-width:            var(--#{$prefix}border-width);
$thumbnail-border-color:            var(--#{$prefix}border-color-subtle); // Boosted mod: instead of `var(--#{$prefix}border-color-translucent)`
$thumbnail-border-radius:           var(--#{$prefix}border-radius);
$thumbnail-box-shadow:              var(--#{$prefix}box-shadow-sm);