justify-content-md-center in bootstrap 3 code example
Example 1: centralize div bootstrap
<div class="row align-items-center justify-content-center">
<div class="col">This will be centered vertically and horizontally</div>
</div>
Example 2: bootstrap row no-wrap
<div class="row flex-nowrap">
<div class="col"></div>
<div class="col"></div>
</div>