bootstrap sample images code example
Example 1: how to make image responsive bootstrap 4
<img src="..." class="img-fluid" alt="Responsive image">
Example 2: bootstrap img src
<img src="..." class="rounded mx-auto d-block" alt="...">
<img src="..." class="img-fluid" alt="Responsive image">
<img src="..." class="rounded mx-auto d-block" alt="...">