Navbars can utilize .navbar-toggler,.navbar-collapse,and .navbar-expand{-sm|-md|-lg|-xl}classes to change when their content collapses behind a button. In combination with other utilities,you can easily choose when to show or hide particular elements.

Use our position utilities to place navbars in non-static positions. Choose from fixed to the top,fixed to the bottom,or stickied to the top(scrolls with the page until it reaches the top,then stays there).for fixed top use .fixed-top,fixed bottom use .fixed-footer,sticky top use .sticky-top