Answers for "justify-content: center; bootstrap"

bootstrap col center content

<div class="row">
    <div class="col-4 d-flex justify-content-center text-center">
        // for image and text
    </div>
</div>

bootstrap justify-content-center for md

<div class="row justify-content-md-center"></div>

bootstrap justify-content-center for lg

<div class="row justify-content-lg-center"><div>