Dimensions This is the third 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.