bootstrap picture gallery code example

Example 1: how to make image responsive bootstrap 4

<img src="..." class="img-fluid" alt="Responsive image">

Example 2: responsive image in bootstrap

<img src="..." class="img-responsive">

Example 3: image responsive bootstrap 4

<img class="img-fluid" src="" alt=""> //This will make your image responsive

Example 4: 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">