Images
Documentation and examples for opting images into responsive behavior (so they never become wider than their parent) 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 width.
<img src="..." class="img-fluid" alt="...">Image thumbnails
You can use .img-thumbnail class 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>
