Is it possible to make blocks col-md-6, for example, to make centered?

Need to say, if a string, it is placed 4 blocks. But if these block are only 2 so they were both in the center? And that all worked automatically. offset is not the same. The number of blocks can vary over time.
June 10th 19 at 16:52
2 answers
June 10th 19 at 16:54
In the 4th version this is done by adding class justify-content-center:
<div class="container">
 <div class="row justify-content-center">
 <div class="col-md-6">
 One of two columns
</div>
 <div class="col-md-6">
 One of two columns
</div>
</div>
</div>
June 10th 19 at 16:56
on a certain resolution of the parent block to put text-align:center, and child 2m which must be centered to assign display:inline-block

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