This is the First item's accordion body. It is hidden by
default, until the collapse plugin adds the appropriate classes that we use
to style each element. These classes control the overall appearance, as well
as the showing and hiding via CSS transitions. You can modify any of this
with custom CSS or overriding our default variables. It's also worth noting
that just about any HTML can go within the .accordion-body
,
though the transition does limit overflow.