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# Images

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 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.

    <img src="..." class="img-fluid" alt="...">

## Image thumbnails

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

    <img src="..." class="img-thumbnail" alt="...">

## 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.

    <img src="..." class="rounded float-start" alt="...">
    <img src="..." class="rounded float-end" alt="...">

    <img src="..." class="rounded mx-auto d-block" alt="...">

    <div class="text-center">
      <img src="..." class="rounded" alt="...">
    </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>

## 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;