image classes bootstrap code example
Example 1: bootstrap Image thumbnails
In addition to our border-radius utilities, you can use
.img-thumbnail to give an image a rounded 1px border appearance.
<img src="..." alt="..." class="img-thumbnail">
Example 2: img-fluid bootstrap
<img class="img-fluid" src="" alt=""> //This will make your image responsive
Example 3: bootstrap img src
<img src="..." class="rounded mx-auto d-block" alt="...">