Containers in Bootstrap are important when programming. Here's everything you need to know about containers in Bootstrap 5 .

What are Containers in Bootstrap?

In Bootstrap, containers are used to set margins for content. It contains row elements and the row element is the column's container. This is called a grid system. You have two container classes in Bootstrap, including:

1. .container
2. .container-fluid

The theory is like that, it's easiest to imagine, in more simple terms, Container creates a box containing other elements inside. This box has a width set according to the size of the display screen.

The table below illustrates how each container's max-width changes with each breakpoint.

For example, when using the .container class, the actual width of the container will be 100% if the viewport width is <576px, 540px if the viewport width is ≥576px but less than <768px, 720px if the viewport width is ≥ 768px but <992px, 960px if viewport width is ≥992px but <1200px, 1140px if viewport width is ≥1200px but <1400px, and 1320px if width is ≥1400px.

Similarly when using class .container-lg, the actual width of the container will be 100% until the viewport width is <992px, 960px if the viewport width is ≥992px but <1200px, 1140px if the viewport width is ≥1200px but <1400px, and 1320px if viewport width ≥1400px.

Bootsrap's grid system	X-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%

In this article, QuanTriMang will provide more detailed instructions on how to use containers and accompanying components in Bootstrap 5. Bootstrap 5 has 2 container classes for you to choose and use:

1. Class .containerprovides a responsive fixed-width container.

1. Class .container-fluidprovides a full-width container that spans the entire width of the viewport.

Learn about 2 types of Containers in Bootstrap 5

Fixed container

Use class .containerto create a responsive, fixed-width container.

Note that its width (max-width) will change on different screen sizes:

Screen size	max-width
Extra Small <576px	100%
Small ≥576px	540px
Medium ≥768px	720px
Large ≥992px	960px
Extra Large ≥1200px	1140px
XXL ≥1400px	1320px

XXL (≥1400px) is new in Bootstrap 5. On Bootstrap 4, only Extra large (≥1200px) is supported.

For example , try using the following code, save it to an HTML file and try opening it in a browser window. Then adjust the window size to see the change!

 Ví dụ Bootstrap 

QuanTriMang's first Bootstrap page

You can learn Bootstrap 5 and other programming software on QuanTriMang

Large container

Use class .container-fluidto create full width container with screen width (width is always 100%)

For example:

QuanTriMang's first Bootstrap page

You can learn Bootstrap 5 and other programming software on QuanTriMang

Additional components for the Container

Container padding intervals

By default, containers have left and right padding, no top/bottom padding. Therefore, we often need to use additional spacing facilities, such as additional padding and margins , to make them look better. For example, .pt-5it means " padding top ". For example:

Border and color of Container

Other widgets, such as borders and colors, are also commonly used in conjunction with Containers.

Example 1:

TipsMake.com

This container has a border and some additional padding and margins.

Example 2:

TipsMake.com

The container has additional formatting of black background, white text and some padding/margin.

Example 3:

TipsMake.com

The container has additional formatting of a blue background, white text and some padding/margin.

You'll learn more about colors and border widgets in later articles!

Responsive Containers

You can also use classes .container-sm | md | lg | xlto determine when the container will be responsive.

max-widthof the container will change on different screen/viewport sizes:

Class	Extra small <576px	Small ≥576px	Medium ≥768px	Large ≥992px	Extra large ≥1200px	XXL ≥1400px
.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

For example:

.container-sm .container-md .container-lg .container-xl .container-xxl

Example on website TipsMake:

 Bootstrap Example 

Containers meet

Resize the browser window to see the change.

 .container-sm .container-md .container-lg .container-xl .container-xxl 

As mentioned above, Bootstrap creates a series of predefined container classes to help you build the web layout you want. You can customize the predefined container classes by editing the Sass map (found in _variables.scss) owns them:

$container-max-widths: ( sm: 540px, md: 720px, lg: 960px, xl: 1140px, xxl: 1320px );

In addition to customizing Sass, you can also create your own containers by combining Sass like the example below:

// Source mixin @mixin make-container($padding-x: $container-padding-x) { width: 100%; padding-right: $padding-x; padding-left: $padding-x; margin-right: auto; margin-left: auto; } // Usage .custom-container { @include make-container(); }

Above is good information on how to create basic containers using Bootstrap 5. Hope the article is useful to you.