bootstrap colons code example
Example 1: no-gutter bootstrap 4
<div class="row no-gutters">
<div class="col-12 col-sm-6 col-md-8">.col-12 .col-sm-6 .col-md-8</div>
<div class="col-6 col-md-4">.col-6 .col-md-4</div>
</div>
Example 2: col offset in bootstrap
.col-md-3 .offset-md-3