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Bootstrap/docs/4.0/content/images.md

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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.

Generic responsive image

{% highlight html %} Responsive image {% endhighlight %}

{% callout warning %}

SVG images and IE 10

In Internet Explorer 10, SVG images with .img-fluid are disproportionately sized. To fix this, add width: 100% \9; where necessary. This fix improperly sizes other image formats, so Bootstrap doesn't apply it automatically. {% endcallout %}

Image thumbnails

In addition to our [border-radius utilities]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/borders/), 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 camera

{% highlight html %} ... {% endhighlight %}

Aligning images

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

A generic square placeholder image with rounded corners A generic square placeholder image with rounded corners

{% highlight html %} ... ... {% endhighlight %}

A generic square placeholder image with rounded corners

{% highlight html %} ... {% endhighlight %}

A generic square placeholder image with rounded corners

{% highlight html %}

...
{% endhighlight %}

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.

{% highlight html %} ... {% endhighlight %}