Bootstrap requires a containing element to wrap site contents and house our grid system. You may choose one of two containers to use in your projects.
.container class for a responsive fixed width container.
<div class="container"> ... </div>
.container-fluid class for a full width container, spanning the entire width of your viewport.
<div class="container-fluid"> ... </div>
Note: Containers are not nestable (you cannot put a container inside another container), due to