Правильная центральная сетка
<div class="container">
<div class="row align-items-center vh-100">
<div class="col-6 mx-auto">
<div class="card shadow border">
<div class="card-body d-flex flex-column align-items-center">
<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>
</div>
</div>
</div>
Confused Camel