To align a line to the center you can use the flexbox property through which you can center a line easily. But the grid system is already centered, you don't need to align it to the center.
Let us understand with the help of an example:
<!doctype html>
<html lang='en'>
<head>
<!-- Required meta tags -->
<meta charset='utf-8'>
<meta name='viewport' content='width=device-width, initial-scale=1'>
<!-- Bootstrap CSS -->
<link href='https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css' rel='stylesheet' integrity='sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC' crossorigin='anonymous'>
<title>Hello, world!</title>
</head>
<body>
<div class='container pt-4 d-flex align-content-center justify-content-center'>
<div class='row'>
<div class='col-sm bg-secondary text-light mx-1'>
One of three columns
</div>
<div class='col-sm bg-secondary text-light mx-1'>
One of three columns
</div>
<div class='col-sm bg-secondary text-light mx-1'>
One of three columns
</div>
</div>
</div>
<!-- Optional JavaScript; choose one of the two! -->
<!-- Option 1: Bootstrap Bundle with Popper -->
<script src='https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js' integrity='sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM' crossorigin='anonymous'></script>
<!-- Option 2: Separate Popper and Bootstrap JS -->
<!--
<script src='https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.2/dist/umd/popper.min.js' integrity='sha384-IQsoLXl5PILFhosVNubq5LC7Qb9DXgDA9i+tQ8Zj3iwWAwPtgFTxbJ8NT4GN1R8p' crossorigin='anonymous'></script>
<script src='https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.min.js' integrity='sha384-cVKIPhGWiC2Al4u+LWgxfKTRIcfu0JTxR+EQDz/bgldoEyl4H0zUF0QKbrJ0EcQF' crossorigin='anonymous'></script>
-->
</body>
</html>
Hope this will help you.
Happy Coding!
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To align a line to the center you can use the flexbox property through which you can center a line easily. But the grid system is already centered, you don't need to align it to the center.
Let us understand with the help of an example:
Hope this will help you.
Happy Coding!