Container
The container centers your content horizontally. It's the most basic layout element.
While containers can be nested, most layouts do not require a nested container.
Fluid
A fluid container width is bounded by that maxWidth property value.
<Container maxWidth="sm">Fixed
If you prefer to design for a fixed set of sizes instead of trying to accommodate a fully fluid viewport, you can set the fixed property.
The max-width matches the min-width of the current breakpoint.
<Container fixed>