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

Responsive images

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

PlaceholderResponsive image
<svg class="docs-placeholder-img docs-placeholder-img-lg img-fluid" width="100%" height="250" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: Responsive image" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"/><text x="50%" y="50%" fill="#dee2e6" dy=".3em">Responsive image</text></svg>

Image thumbnails

In addition to our border-radius utilities, you can use .img-thumbnail to give an image a rounded 1px border appearance.

A generic square placeholder image with a white border around it, making it resemble a photograph taken with an old instant camera200x200
<svg class="docs-placeholder-img img-thumbnail" width="200" height="200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="A generic square placeholder image with a white border around it, making it resemble a photograph taken with an old instant camera: 200x200" preserveAspectRatio="xMidYMid slice" focusable="false"><title>A generic square placeholder image with a white border around it, making it resemble a photograph taken with an old instant camera</title><rect width="100%" height="100%" fill="#868e96"/><text x="50%" y="50%" fill="#dee2e6" dy=".3em">200x200</text></svg>

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
<svg class="docs-placeholder-img rounded float-start" width="200" height="200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: 200x200" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"/><text x="50%" y="50%" fill="#dee2e6" dy=".3em">200x200</text></svg>

<svg class="docs-placeholder-img rounded float-end" width="200" height="200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: 200x200" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"/><text x="50%" y="50%" fill="#dee2e6" dy=".3em">200x200</text></svg>
Placeholder200x200
<svg class="docs-placeholder-img rounded mx-auto d-block" width="200" height="200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: 200x200" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"/><text x="50%" y="50%" fill="#dee2e6" dy=".3em">200x200</text></svg>
Placeholder200x200
<div class="text-center">
  <svg class="docs-placeholder-img rounded" width="200" height="200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: 200x200" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"/><text x="50%" y="50%" fill="#dee2e6" dy=".3em">200x200</text></svg>

</div>

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>

Customization

SASS

Variables

Variables are available for image thumbnails.

$thumbnail-padding:                 .25rem;
$thumbnail-bg:                      $body-bg;
$thumbnail-border-width:            $border-width;
$thumbnail-border-color:            $gray-300;
$thumbnail-border-radius:           $border-radius;
$thumbnail-box-shadow:              $box-shadow-sm;