Bootstrap 4 center image

/* used mx-auto d-block */

<img class="mx-auto d-block" src="https://www.w3schools.com/bootstrap4/paris.jpg" alt="https://www.w3schools.com/bootstrap4/paris.jpg"/>

Bootstrap class align center image

class="mx-auto d-block"

Image responsive bootstrap 4

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

Source: stackoverflow.com

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