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Bootstrap/site/content/docs/4.3/layout/containers.md
Mark Otto 7dedccfb9a Update docs for new XXL grid tier 
- Updates mentions of number and exact tiers
- Updates grid example to include xxl container
- Adds some scss-docs references
- Cleans up other grid mentions and docs
- Updates navbar example to include an expand at XXL variant
2020-04-13 14:40:47 -07:00

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layout title description group toc
docs Containers Containers are a fundamental building block of Bootstrap that contain, pad, and align your content withing a given device or viewport. layout true

How they work

Containers are the most basic layout element in Bootstrap and are required when using our default grid system. Containers are used to contain, pad, and (sometimes) center the content within them. While containers can be nested, most layouts do not require a nested container.

Bootstrap comes with three different containers:

  • .container, which sets a max-width at each responsive breakpoint
  • .container-fluid, which is width: 100% at all breakpoints
  • .container-{breakpoint}, which is width: 100% until the specified breakpoint

The table below illustrates how each container's max-width compares to the original .container and .container-fluid across each breakpoint.

See them in action and compare them in our [Grid example]({{< docsref "/examples/grid#containers" >}}).

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%

Default container

Our default .container class is a responsive, fixed-width container, meaning its max-width changes at each breakpoint.

{{< highlight html >}}

{{< /highlight >}}

Responsive containers

Responsive containers allow you to specify a class that is 100% wide until the specified breakpoint is reached, after which we apply max-widths for each of the higher breakpoints. For example, .container-sm is 100% wide to start until the sm breakpoint is reached, where it will scale up with md, lg, xl, and xxl.

{{< highlight html >}}

100% wide until small breakpoint
100% wide until medium breakpoint
100% wide until large breakpoint
100% wide until extra large breakpoint
100% wide until extra extra large breakpoint
{{< /highlight >}}

Fluid containers

Use .container-fluid for a full width container, spanning the entire width of the viewport.

{{< highlight html >}}

...
{{< /highlight >}}

Sass

As shown above, Bootstrap generates a series of predefined container classes to help you build the layouts you desire. You may customize these predefined container classes by modifying the Sass map (found in _variables.scss) that powers them:

{{< scss-docs name="container-max-widths" file="scss/_variables.scss" >}}

In addition to customizing the Sass, you can also create your own containers with our Sass mixin.

{{< highlight scss >}} // 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(); } {{< /highlight >}}

For more information and examples on how to modify our Sass maps and variables, please refer to [the Sass section of the Grid documentation]({{< docsref "/layout/grid#sass" >}}).