Bootstrap/site/content/docs/4.6/content/images.md

layout	title	description	group	toc
docs	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.	content	true

Responsive images

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

{{< example >}} {{< placeholder width="100%" height="250" class="bd-placeholder-img-lg img-fluid" text="Responsive image" >}} {{< /example >}}

{{< callout warning >}}

SVG images and Internet Explorer

In Internet Explorer 10 and 11, SVG images with .img-fluid are disproportionately sized. To fix this, add width: 100%; or .w-100 where necessary. This fix improperly sizes other image formats, so Bootstrap doesn't apply it automatically. {{< /callout >}}

Image thumbnails

In addition to our [border-radius utilities]({{< docsref "/utilities/borders" >}}), you can use .img-thumbnail to give an image a rounded 1px border appearance.

{{< example >}} {{< placeholder width="200" height="200" class="img-thumbnail" title="A generic square placeholder image with a white border around it, making it resemble a photograph taken with an old instant camera" >}} {{< /example >}}

Aligning images

Align images with the [helper float classes]({{< docsref "/utilities/float" >}}) or [text alignment classes]({{< docsref "/utilities/text#text-alignment" >}}). block-level images can be centered using [the .mx-auto margin utility class]({{< docsref "/utilities/spacing#horizontal-centering" >}}).

{{< example >}} {{< placeholder width="200" height="200" class="rounded float-left" >}} {{< placeholder width="200" height="200" class="rounded float-right" >}} {{< /example >}}

{{< example >}} {{< placeholder width="200" height="200" class="rounded mx-auto d-block" >}} {{< /example >}}

{{< example >}}

{{< placeholder width="200" height="200" class="rounded" >}}

{{< /example >}}

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>