bootstrap css image 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: bootstrap img src
<img src="..." class="rounded mx-auto d-block" alt="...">
Example 3: img class bootstrap
<img src="cinqueterre.jpg" class="img-circle" alt="Cinque Terre">
<img src="cinqueterre.jpg" class="img-rounded" alt="Cinque Terre">
<img src="cinqueterre.jpg" class="img-thumbnail" alt="Cinque Terre">