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92 lines
4.5 KiB
Markdown
92 lines
4.5 KiB
Markdown
---
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layout: docs
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title: Containers
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description: Containers are a fundamental building block of Bootstrap that contain, pad, and align your content within a given device or viewport.
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group: layout
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toc: true
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---
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## How they work
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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.
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Bootstrap comes with three different containers:
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- `.container`, which sets a `max-width` at each responsive breakpoint
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- `.container-{breakpoint}`, which is `width: 100%` until the specified breakpoint
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- `.container-fluid`, which is `width: 100%` at all breakpoints
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The table below illustrates how each container's `max-width` compares to the original `.container` and `.container-fluid` across each breakpoint.
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See them in action and compare them in our [Grid example]({{< docsref "/examples/grid#containers" >}}).
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{{< bs-table "table" >}}
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| | Extra small<div class="fw-normal"><576px</div> | Small<div class="fw-normal">≥576px</div> | Medium<div class="fw-normal">≥768px</div> | Large<div class="fw-normal">≥992px</div> | X-Large<div class="fw-normal">≥1200px</div> | XX-Large<div class="fw-normal">≥1400px</div> |
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| --- | --- | --- | --- | --- | --- | --- |
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| `.container` | <span class="text-muted">100%</span> | 540px | 720px | 960px | 1140px | 1320px |
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| `.container-sm` | <span class="text-muted">100%</span> | 540px | 720px | 960px | 1140px | 1320px |
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| `.container-md` | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | 720px | 960px | 1140px | 1320px |
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| `.container-lg` | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | 960px | 1140px | 1320px |
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| `.container-xl` | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | 1140px | 1320px |
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| `.container-xxl` | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | 1320px |
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| `.container-fluid` | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> | <span class="text-muted">100%</span> |
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{{< /bs-table >}}
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## Default container
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Our default `.container` class is a responsive, fixed-width container, meaning its `max-width` changes at each breakpoint.
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```html
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<div class="container">
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<!-- Content here -->
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</div>
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```
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## Responsive containers
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Responsive containers allow you to specify a class that is 100% wide until the specified breakpoint is reached, after which we apply `max-width`s 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`.
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```html
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<div class="container-sm">100% wide until small breakpoint</div>
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<div class="container-md">100% wide until medium breakpoint</div>
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<div class="container-lg">100% wide until large breakpoint</div>
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<div class="container-xl">100% wide until extra large breakpoint</div>
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<div class="container-xxl">100% wide until extra extra large breakpoint</div>
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```
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## Fluid containers
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Use `.container-fluid` for a full width container, spanning the entire width of the viewport.
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```html
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<div class="container-fluid">
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...
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</div>
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```
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## Sass
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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:
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{{< scss-docs name="container-max-widths" file="scss/_variables.scss" >}}
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In addition to customizing the Sass, you can also create your own containers with our Sass mixin.
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```scss
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// Source mixin
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@mixin make-container($padding-x: $container-padding-x) {
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width: 100%;
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padding-right: $padding-x;
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padding-left: $padding-x;
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margin-right: auto;
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margin-left: auto;
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}
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// Usage
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.custom-container {
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@include make-container();
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}
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```
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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" >}}).
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