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---
layout: docs
title: Containers
description: Containers are a fundamental building block of Bootstrap that contain, pad, and align your content within a given device or viewport.
group: layout
toc: 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" >}}).
<table class="table">
<thead>
<tr>
<td class="border-dark"></td>
<th scope="col">
Extra small<br>
<span class="fw-normal"><576px</span>
</th>
<th scope="col">
Small<br>
<span class="fw-normal">≥576px</span>
</th>
<th scope="col">
Medium<br>
<span class="fw-normal">≥768px</span>
</th>
<th scope="col">
Large<br>
<span class="fw-normal">≥992px</span>
</th>
<th scope="col">
X-Large<br>
<span class="fw-normal">≥1200px</span>
</th>
<th scope="col">
XX-Large<br>
<span class="fw-normal">≥1400px</span>
</th>
</tr>
</thead>
<tbody>
<tr>
<th scope="row" class="fw-normal"><code>.container</code></th>
<td class="text-muted">100%</td>
<td>540px</td>
<td>720px</td>
<td>960px</td>
<td>1140px</td>
<td>1320px</td>
</tr>
<tr>
<th scope="row" class="fw-normal"><code>.container-sm</code></th>
<td class="text-muted">100%</td>
<td>540px</td>
<td>720px</td>
<td>960px</td>
<td>1140px</td>
<td>1320px</td>
</tr>
<tr>
<th scope="row" class="fw-normal"><code>.container-md</code></th>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td>720px</td>
<td>960px</td>
<td>1140px</td>
<td>1320px</td>
</tr>
<tr>
<th scope="row" class="fw-normal"><code>.container-lg</code></th>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td>960px</td>
<td>1140px</td>
<td>1320px</td>
</tr>
<tr>
<th scope="row" class="fw-normal"><code>.container-xl</code></th>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td>1140px</td>
<td>1320px</td>
</tr>
<tr>
<th scope="row" class="fw-normal"><code>.container-xxl</code></th>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td>1320px</td>
</tr>
<tr>
<th scope="row" class="fw-normal"><code>.container-fluid</code></th>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
<td class="text-muted">100%</td>
</tr>
</tbody>
</table>
## Default container
Our default `.container` class is a responsive, fixed-width container, meaning its `max-width` changes at each breakpoint.
```html
<div class="container">
<!-- Content here -->
</div>
```
## 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-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`.
```html
<div class="container-sm">100% wide until small breakpoint</div>
<div class="container-md">100% wide until medium breakpoint</div>
<div class="container-lg">100% wide until large breakpoint</div>
<div class="container-xl">100% wide until extra large breakpoint</div>
<div class="container-xxl">100% wide until extra extra large breakpoint</div>
```
## Fluid containers
Use `.container-fluid` for a full width container, spanning the entire width of the viewport.
```html
<div class="container-fluid">
...
</div>
```
## 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.
```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();
}
```
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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