Container

<div class="bg-body-tertiary p-5 rounded mt-3"> </div>

• bg-body-tertiary: Applies a dark background defined by Bootstrap;
• p-5: Adds padding inside the block. p-5 sets large padding;
• rounded: Rounds the corners of the block, giving it a visually rounded appearance.
• mt-3: Adds a top margin of size 3 (distance between this block and the preceding element).

Button

<a class="btn btn-lg btn-primary" href="/docs/"> </a>

Creates a link with the classes btn (indicating it's a button), btn-lg (large button), and btn-primary (applies the primary button style). The link points to /docs/.

This code utilizes Bootstrap classes and styles for quick and easy styling and positioning of elements on the page. Bootstrap provides pre-defined styles and components, streamlining the development process and enhancing the appearance and behavior of websites.