Background Attachment
Utilities for controlling the way an element's background image position is fixed within the viewport or scrolls with its containing block.
Scroll
This is the default behavior. Use d-bga-scroll to fix the background image to the element. It does not scroll with its content.
<div class="... d-bga-scroll">...</div>
Fixed
Use d-bga-fixed to fix the background image to the viewport. The background image does not scroll with the content.
<div class="... d-bga-fixed">...</div>
Local
Use d-bga-local to fix background image relative to the element's contents. If the element is scrollable, the
background scrolls with the element's contents, and background area and positioning are relative to the scrollable area
of the element rather than the viewable box.
<div class="... d-bga-local">...</div>