Image thumbnails
In addition to our border-radius utilities,you can use .img-thumbnailto give an image a rounded 1px border appearance.
Image Rounded & Circle
Use classes .roundedand .rounded-circle avatar-md.
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.
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.
