# Bootstrap 5 Grid system

AdminKit for Bootstrap has a mobile-first flexbox grid for layouts of all sizes, with a column system and six responsive tiers.

Use AdminKit for Bootstrap's mobile-first flexbox grid to build layouts of all shapes and sizes with the column system, six default responsive tiers and dozens of predefined classes.

## Example

Bootstrap's grid system uses a series of containers, rows, and columns to layout and align content. It's built with flexbox and is fully responsive. Below is an example and an explanation of how the grid system comes together.

```html
<div class="container">
  <div class="row">
    <div class="col">
      Column
    </div>
    <div class="col">
      Column
    </div>
    <div class="col">
      Column
    </div>
  </div>
</div>
```

The above example creates three equal-width columns across all devices and viewports using our predefined grid classes. Those columns are centered in the page with the parent `.container`.

## Grid options

Bootstrap's grid system can adapt across all six default breakpoints, and any breakpoints you customize. The six default grid tiers are as follow:

- Extra small (xs)
- Small (sm)
- Medium (md)
- Large (lg)
- Extra large (xl)
- Extra extra large (xxl)

As noted above, each of these breakpoints have their own container, unique class prefix, and modifiers. Here's how the grid changes across these breakpoints:

<table class="table mb-4">
  <thead>
    <tr>
      <th scope="col"></th>
      <th scope="col">
        xs<br />
        <span class="fw-normal">&lt;576px</span>
      </th>
      <th scope="col">
        sm<br />
        <span class="fw-normal">&ge;576px</span>
      </th>
      <th scope="col">
        md<br />
        <span class="fw-normal">&ge;768px</span>
      </th>
      <th scope="col">
        lg<br />
        <span class="fw-normal">&ge;992px</span>
      </th>
      <th scope="col">
        xl<br />
        <span class="fw-normal">&ge;1200px</span>
      </th>
      <th scope="col">
        xxl<br />
        <span class="fw-normal">&ge;1400px</span>
      </th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th class="text-nowrap" scope="row">Container <code class="fw-normal">max-width</code></th>
      <td>None (auto)</td>
      <td>540px</td>
      <td>720px</td>
      <td>960px</td>
      <td>1140px</td>
      <td>1320px</td>
    </tr>
    <tr>
      <th class="text-nowrap" scope="row">Class prefix</th>
      <td><code>.col-</code></td>
      <td><code>.col-sm-</code></td>
      <td><code>.col-md-</code></td>
      <td><code>.col-lg-</code></td>
      <td><code>.col-xl-</code></td>
      <td><code>.col-xxl-</code></td>
    </tr>
    <tr>
      <th class="text-nowrap" scope="row"># of columns</th>
      <td colspan="6">12</td>
    </tr>
    <tr>
      <th class="text-nowrap" scope="row">Gutter width</th>
      <td colspan="6">1.5rem (.75rem on left and right)</td>
    </tr>
    <tr>
      <th class="text-nowrap" scope="row">Custom gutters</th>
      <td colspan="6"><a href="/bootstrap/docs/foundation/gutters/">Yes</a></td>
    </tr>
    <tr>
      <th class="text-nowrap" scope="row">Nestable</th>
      <td colspan="6"><a href="#nesting">Yes</a></td>
    </tr>
    <tr>
      <th class="text-nowrap" scope="row">Column ordering</th>
      <td colspan="6"><a href="/bootstrap/docs/foundation/columns/#reordering">Yes</a></td>
    </tr>
  </tbody>
</table>

## Auto-layout columns

Use breakpoint-specific column classes to size columns without an explicit numbered class like `.col-sm-6`.

### Equal-width

For example, here are two grid layouts that apply to every device and viewport, from `xs` to `xxl`. Add any number of unit-less classes for each breakpoint you need and every column will be the same width.

```html
<div class="container">
  <div class="row">
    <div class="col">
      1 of 2
    </div>
    <div class="col">
      2 of 2
    </div>
  </div>
  <div class="row">
    <div class="col">
      1 of 3
    </div>
    <div class="col">
      2 of 3
    </div>
    <div class="col">
      3 of 3
    </div>
  </div>
</div>
```

### Setting one column width

Auto-layout for flexbox grid columns also means you can set the width of one column and have the sibling columns automatically resize around it. You may use predefined grid classes (as shown below), grid mixins, or inline widths. Note that the other columns will resize no matter the width of the center column.

```html
<div class="container">
  <div class="row">
    <div class="col">
      1 of 3
    </div>
    <div class="col-6">
      2 of 3 (wider)
    </div>
    <div class="col">
      3 of 3
    </div>
  </div>
  <div class="row">
    <div class="col">
      1 of 3
    </div>
    <div class="col-5">
      2 of 3 (wider)
    </div>
    <div class="col">
      3 of 3
    </div>
  </div>
</div>
```

### Variable width content

Use `col-{breakpoint}-auto` classes to size columns based on the natural width of their content.

```html
<div class="container">
  <div class="row justify-content-md-center">
    <div class="col col-lg-2">
      1 of 3
    </div>
    <div class="col-md-auto">
      Variable width content
    </div>
    <div class="col col-lg-2">
      3 of 3
    </div>
  </div>
  <div class="row">
    <div class="col">
      1 of 3
    </div>
    <div class="col-md-auto">
      Variable width content
    </div>
    <div class="col col-lg-2">
      3 of 3
    </div>
  </div>
</div>
```

## Responsive classes

Bootstrap's grid includes six tiers of predefined classes for building complex responsive layouts. Customize the size of your columns on extra small, small, medium, large, or extra large devices however you see fit.

### All breakpoints

For grids that are the same from the smallest of devices to the largest, use the `.col` and `.col-*` classes. Specify a numbered class when you need a particularly sized column; otherwise, feel free to stick to `.col`.

```html
<div class="container">
  <div class="row">
    <div class="col">col</div>
    <div class="col">col</div>
    <div class="col">col</div>
    <div class="col">col</div>
  </div>
  <div class="row">
    <div class="col-8">col-8</div>
    <div class="col-4">col-4</div>
  </div>
</div>
```

### Stacked to horizontal

Using a single set of `.col-sm-*` classes, you can create a basic grid system that starts out stacked and becomes horizontal at the small breakpoint (`sm`).

```html
<div class="container">
  <div class="row">
    <div class="col-sm-8">col-sm-8</div>
    <div class="col-sm-4">col-sm-4</div>
  </div>
  <div class="row">
    <div class="col-sm">col-sm</div>
    <div class="col-sm">col-sm</div>
    <div class="col-sm">col-sm</div>
  </div>
</div>
```

### Mix and match

To keep columns from stacking in some grid tiers, combine different classes for each tier, as in the example below.

```html
<div class="container">
  <!-- Stack the columns on mobile by making one full-width and the other half-width -->
  <div class="row">
    <div class="col-md-8">.col-md-8</div>
    <div class="col-6 col-md-4">.col-6 .col-md-4</div>
  </div>

  <!-- Columns start at 50% wide on mobile and bump up to 33.3% wide on desktop -->
  <div class="row">
    <div class="col-6 col-md-4">.col-6 .col-md-4</div>
    <div class="col-6 col-md-4">.col-6 .col-md-4</div>
    <div class="col-6 col-md-4">.col-6 .col-md-4</div>
  </div>

  <!-- Columns are always 50% wide, on mobile and desktop -->
  <div class="row">
    <div class="col-6">.col-6</div>
    <div class="col-6">.col-6</div>
  </div>
</div>
```

### Row columns

Use the responsive `.row-cols-*` classes to quickly set the number of columns that best render your content and layout. Whereas normal `.col-*` classes apply to the individual columns (e.g., `.col-md-4`), the row columns classes are set on the parent `.row` as a shortcut. With `.row-cols-auto` you can give the columns their natural width.

Use these row columns classes to quickly create basic grid layouts or to control your card layouts.

```html
<div class="container">
  <div class="row row-cols-2">
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col">Column</div>
  </div>
</div>
```

```html
<div class="container">
  <div class="row row-cols-3">
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col">Column</div>
  </div>
</div>
```

```html
<div class="container">
  <div class="row row-cols-auto">
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col">Column</div>
  </div>
</div>
```

```html
<div class="container">
  <div class="row row-cols-4">
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col">Column</div>
  </div>
</div>
```

```html
<div class="container">
  <div class="row row-cols-4">
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col-6">Column</div>
    <div class="col">Column</div>
  </div>
</div>
```

```html
<div class="container">
  <div class="row row-cols-1 row-cols-sm-2 row-cols-md-4">
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col">Column</div>
    <div class="col">Column</div>
  </div>
</div>
```

## Nesting

To nest your content with the default grid, add a new `.row` and set of `.col-sm-*` columns within an existing `.col-sm-*` column. Nested rows should include a set of columns that add up to 12 or fewer (it is not required that you use all 12 available columns).

```html
<div class="container">
  <div class="row">
    <div class="col-sm-3">
      Level 1: .col-sm-3
    </div>
    <div class="col-sm-9">
      <div class="row">
        <div class="col-8 col-sm-6">
          Level 2: .col-8 .col-sm-6
        </div>
        <div class="col-4 col-sm-6">
          Level 2: .col-4 .col-sm-6
        </div>
      </div>
    </div>
  </div>
</div>
```

## About

How the grid system comes together:

- Our grid supports six responsive breakpoints. Breakpoints are based on `min-width` media queries, meaning they affect that breakpoint and all those above it (e.g., `.col-sm-4` applies to `sm`, `md`, `lg`, `xl`, and `xxl`). This means you can control container and column sizing and behavior by each breakpoint.

- Containers center and horizontally pad your content. Use `.container` for a responsive pixel width, `.container-fluid` for `width: 100%` across all viewports and devices, or a responsive container (e.g., `.container-md`) for a combination of fluid and pixel widths.

- Rows are wrappers for columns. Each column has horizontal `padding` (called a gutter) for controlling the space between them. This `padding` is then counteracted on the rows with negative margins to ensure the content in your columns is visually aligned down the left side. Rows also support modifier classes to [uniformly apply column sizing](#row-columns) and [gutter classes](/bootstrap/docs/foundation/gutters/) to change the spacing of your content.

- There are 12 template columns per row, so elements can span any number of columns in different combinations. Column classes indicate the number of template columns to span (e.g., `col-4` spans four). `width`s are set in percentages so you always have the same relative sizing.

- Gutters are also responsive and customizable. [Gutter classes are available](/bootstrap/docs/foundation/gutters/) across all breakpoints, with all the same sizes as our [margin and padding spacing](/bootstrap/docs/utilities/spacing/). Change horizontal gutters with `.gx-*` classes, vertical gutters with `.gy-*`, or all gutters with `.g-*` classes. `.g-0` is also available to remove gutters.

- Sass variables, maps, and mixins power the grid. Instead of the predefined grid classes, you can use our [grid's source Sass](#sass) to create your own with more semantic markup. Some CSS custom properties also expose these Sass variables.

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