Bootstrap Class Align Centre Image
class="mx-auto d-block"
the preacher
class="mx-auto d-block"Align images with the helper float classes or text alignment classes.
block-level images can be centered using the .mx-auto margin utility class.
<img src="..." class="rounded float-left" alt="...">
<img src="..." class="rounded float-right" alt="...">
<img src="..." class="rounded mx-auto d-block" alt="..."><img src="..." class="rounded mx-auto d-block" alt="..."><div class="text-center">
<img src="..." class="rounded" alt="...">
</div><img src="..." class="rounded float-start" alt="...">
<img src="..." class="rounded float-end" alt="...">