bootstrap align content in column. code example
Example 1: bootstrap 4 center div
<div class="d-flex justify-content-start">...</div>
<div class="d-flex justify-content-end">...</div>
<div class="d-flex justify-content-center">...</div>
<div class="d-flex justify-content-between">...</div>
<div class="d-flex justify-content-around">...</div>
Example 2: columns center bootstrap 3
<div class="row">
<div class="col-md-2 col-md-offset-5"></div>
</div>