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. max-width: 100%; and height: auto; are applied to the image so that it scales with the parent element.
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.
Image thumbnails
In
addition to our border-radius utilities, you can use .img-thumbnail to give an image a rounded 1px border appearance.
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.