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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.

PlaceholderResponsive image 
<img src="..." class="img-fluid" 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. and height: auto; to the image so that it scales with the parent element.

Placeholder 200x200 Placeholder 200x200 
<img src="..." class="rounded float-start" alt="...">
<img src="..." class="rounded float-end" alt="...">
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 
<img src="..." class="img-thumbnail" alt="...">
Center

Aligning image horizontally center.

Placeholder 200x200 
<img src="..." class="rounded mx-auto d-block" alt="...">