inline background color classes in bs4 code example

Example 1: bootstrap bg-light color code

/* class bg-light color code is---*/
background-color:#f8f9fa;

Example 2: bootstrap color a div

use something like :
<div class="container alert alert-success">
   <div class="row">
      <div class="col">I'm your content inside the grid!</div>
   </div>
</div>