Bootstrap is a front-end framework that facilitates the creation of responsive web designs. It's used with HTML and CSS to provide various layout components such as typography, forms, and buttons.
Note: To know more about Bootstrap and how to use it, please refer to the following links:
To wrap a page content with Bootstrap, we use the .container class.  Containers are used to pad and align the content of a webpage. There are three different types of containers used in Bootstrap:
container container-fluidcontainer-{breakpoint} container classThis is the default container class and sets a max-width at each breakpoint to create a fix-width container.
Note: Breakpoints are customizable widths that dictate the behavior of a responsive webpage across different screen sizes.
<div class = "container">...</div>
The code below demonstrates how the container class can be used to wrap page content:
container classto the div tag.h1 tag in the container class. container-fluid classThis container spans the entire width of the screen. To learn more about this class, please refer to this link.
<div class = "container-fluid">...</div>
container-{breakpoint} classThis container is full-width until a specified breakpoint is reached, after which the max-width will change to a higher breakpoint.
There are five types of breakpoints:
container-sm: The container is 100% wide until the small breakpoint is reached.container-md: The container is 100% wide until the medium breakpoint is reached.container-lg: The container is 100% wide until the large breakpoint is reached.container-xl: The container is 100% wide until the extra-large breakpoint is reached.container-xxl: The container is 100% wide until the extra-extra-large breakpoint is reached.<div class = "container-sm">...</div>
Any of the other responsive containers can replace the container-sm class in the syntax above.
max-width comparisonsThe table below shows how the max-width of each container compares with the other:
| Container class | Extra small < 576px | Small ≥576px | Medium ≥768px | Large ≥992px | X-Large ≥1200px | XX-Large ≥1400px | 
| container | 100% | 540px | 720px | 960px | 1140px | 1320px | 
| container-sm | 100% | 540px | 720px | 960px | 1140px | 1320px | 
| container-md | 100% | 100% | 720px | 960px | 1140px | 1320px | 
| container-lg | 100% | 100% | 100% | 960px | 1140px | 1320px | 
| container-xl | 100% | 100% | 100% | 100% | 1140px | 1320px | 
| container-xxl | 100% | 100% | 100% | 100% | 100% | 1320px | 
| container-fluid | 100% | 100% | 100% | 100% | 100% | 100% | 
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