Align two divs horizontally side by side center to the page using bootstrap css

Use the bootstrap classes col-xx-# and col-xx-offset-#

So what is happening here is your screen is getting divided into 12 columns. In col-xx-#, # is the number of columns you cover and offset is the number of columns you leave.

For xx, in a general website, md is preferred and if you want your layout to look the same in a mobile device, xs is preferred.

With what I can make of your requirement,

<div class="row">
  <div class="col-md-4">First Div</div>
  <div class="col-md-8">Second DIV </div>
</div>

Should do the trick.

Alternate Bootstrap 4 solution (this way you can use divs which are smaller than col-6):

<div class="container">
  <div class="row justify-content-center">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
</div>

More

This should do the trick:

<div class="container">
    <div class="row">
        <div class="col-xs-6">
            ONE
        </div>
        <div class="col-xs-6">
            TWO
        </div>
    </div>
</div>

Have a read of the grid system section of the Bootstrap docs to familiarise yourself with how Bootstrap's grids work:

http://getbootstrap.com/css/#grid