Accordion body color does not cover entire body

[jhoward-eightfold]

On the element providing the body background color for accordions, there is margin to provide gutters around the sides, but this creates strips without background color. Forward fixed with:

[class*='accordion-body-container'] {
  background-color: var(--accordion-body-background-color);
}

[dkilgore-eightfold]

Use the CSS variable, scoped locally for now.

e.g.

.my-accordion-class {
  --accordion-body-background-color: red;
  ...
}

[dkilgore-eightfold]

Fixed as part of https://github.com/EightfoldAI/octuple/pull/783