.accordion-body, though the transition does limit overflow. .accordion-body, though the transition does limit overflow. It is shown by default, until the collapse plugin adds the appropriate classes that we use to style each element. .accordion-body, though the transition does limit overflow. It is shown by default, until the collapse plugin adds the appropriate classes that we use to style each element. .accordion-body, though the transition does limit overflow. It is shown by default, until the collapse plugin adds the appropriate classes that we use to style each element. You can modify any of this with custom CSS or overriding our default variables. These classes control the overall appearance, as well as the showing and hiding via CSS transitions.