Screen Size

Here you can see the sample of screen size.

Size        | Class Prefix
Extra small | .col-
Small       | .col-sm-
Medium      | .col-md-
Large       | .col-lg-
Extra large | .col-xl-

= extra small screens (Mobile)
<div class="col-xs-6">Column 1</div>
<div class="col-xs-6">Column 2</div>​

sm = small screens (Tablets)
<div class="col-sm-6">Column 1</div>
<div class="col-sm-6">Column 2</div>​

md = medium screens (Laptos)
<div class="col-md-6">Column 1</div>
<div class="col-md-6">Column 2</div>​

lg = large screens (Desktops)
<div class="col-lg-6">Column 1</div>
<div class="col-lg-6">Column 2</div>​

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