make a form with a black background bootstrap 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>