bootstrap 4 card center code example
Example 1: card center in bootstrap
.card {
margin: 0 auto; /* Added */
float: none; /* Added */
margin-bottom: 10px; /* Added */
}
Example 2: bootstrap + cards
<div class="card" style="width: 18rem;">
<img class="card-img-top" src="..." alt="Card image cap">
<div class="card-body">
<h5 class="card-title">Card title</h5>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
<a href="#" class="btn btn-primary">Go somewhere</a>
</div>
</div>