img center in div bootstrap 4 code example

Example 1: bootstrap class align center image

class="mx-auto d-block"

Example 2: bootstrap Aligning images

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="...">

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Misc Example