col 6 vs col4 code example
Example 1: bootstrap col-md-5 center
<div class="container">
<div class="row">
<div class="col-sm-5 mx-auto">
Centered
</div>
</div>
</div>
Example 2: bootstrap grids examples
<div class="container">
<div class="row">
<div class="col-md-8">.col-md-8</div>
<div class="col-md-4">.col-md-4</div>
</div>
</div>