How to use xs in bootstrap?

Use our powerful mobile-first flexbox grid to build layouts of all shapes and sizes thanks to a twelve column system, five default responsive tiers, Sass variables and mixins, and dozens of predefined classes.

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 in-depth look at how the grid comes together.

New to or unfamiliar with flexbox? Read this CSS Tricks flexbox guide for background, terminology, guidelines, and code snippets.

The above example creates three equal-width columns on small, medium, large, and extra large devices using our predefined grid classes. Those columns are centered in the page with the parent .container.

Breaking it down, here’s how it works:

Be aware of the limitations and bugs around flexbox, like the inability to use some HTML elements as flex containers.

While Bootstrap uses ems or rems for defining most sizes, pxs are used for grid breakpoints and container widths. This is because the viewport width is in pixels and does not change with the font size.

See how aspects of the Bootstrap grid system work across multiple devices with a handy table.

Utilize breakpoint-specific column classes for easy column sizing without an explicit numbered class like .col-sm-6.

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

Equal-width columns can be broken into multiple lines, but there was a Safari flexbox bug that prevented this from working without an explicit flex-basis or border. There are workarounds for older browser versions, but they shouldn’t be necessary if you’re up-to-date.

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.

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

Create equal-width columns that span multiple rows by inserting a .w-100 where you want the columns to break to a new line. Make the breaks responsive by mixing the .w-100 with some responsive display utilities.

Bootstrap’s grid includes five 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.

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.

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

Don’t want your columns to simply stack in some grid tiers? Use a combination of different classes for each tier as needed. See the example below for a better idea of how it all works.

Use flexbox alignment utilities to vertically and horizontally align columns.

The gutters between columns in our predefined grid classes can be removed with .no-gutters. This removes the negative margins from .row and the horizontal padding from all immediate children columns.

Here’s the source code for creating these styles. Note that column overrides are scoped to only the first children columns and are targeted via attribute selector. While this generates a more specific selector, column padding can still be further customized with spacing utilities.

Need an edge-to-edge design? Drop the parent .container or .container-fluid.

In practice, here’s how it looks. Note you can continue to use this with all other predefined grid classes (including column widths, responsive tiers, reorders, and more).

If more than 12 columns are placed within a single row, each group of extra columns will, as one unit, wrap onto a new line.

Breaking columns to a new line in flexbox requires a small hack: add an element with width: 100% wherever you want to wrap your columns to a new line. Normally this is accomplished with multiple .rows, but not every implementation method can account for this.

You may also apply this break at specific breakpoints with our responsive display utilities.

Use .order- classes for controlling the visual order of your content. These classes are responsive, so you can set the order by breakpoint (e.g., .order-1.order-md-2). Includes support for 1 through 12 across all five grid tiers.

There are also responsive .order-first and .order-last classes that change the order of an element by applying order: -1 and order: 13 (order: $columns + 1), respectively. These classes can also be intermixed with the numbered .order-* classes as needed.

You can offset grid columns in two ways: our responsive .offset- grid classes and our margin utilities. Grid classes are sized to match columns while margins are more useful for quick layouts where the width of the offset is variable.

Move columns to the right using .offset-md-* classes. These classes increase the left margin of a column by * columns. For example, .offset-md-4 moves .col-md-4 over four columns.

In addition to column clearing at responsive breakpoints, you may need to reset offsets. See this in action in the grid example.

With the move to flexbox in v4, you can use margin utilities like .mr-auto to force sibling columns away from one another.

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).

When using Bootstrap’s source Sass files, you have the option of using Sass variables and mixins to create custom, semantic, and responsive page layouts. Our predefined grid classes use these same variables and mixins to provide a whole suite of ready-to-use classes for fast responsive layouts.

Variables and maps determine the number of columns, the gutter width, and the media query point at which to begin floating columns. We use these to generate the predefined grid classes documented above, as well as for the custom mixins listed below.

Mixins are used in conjunction with the grid variables to generate semantic CSS for individual grid columns.

You can modify the variables to your own custom values, or just use the mixins with their default values. Here’s an example of using the default settings to create a two-column layout with a gap between.

Using our built-in grid Sass variables and maps, it’s possible to completely customize the predefined grid classes. Change the number of tiers, the media query dimensions, and the container widths—then recompile.

The number of grid columns can be modified via Sass variables. $grid-columns is used to generate the widths (in percent) of each individual column while $grid-gutter-width allows breakpoint-specific widths that are divided evenly across padding-left and padding-right for the column gutters.

Get three equal-width columns starting at desktops and scaling to large desktops. On mobile devices, tablets and below, the columns will automatically stack.

Get three columns starting at desktops and scaling to large desktops of various widths. Remember, grid columns should add up to twelve for a single horizontal block. More than that, and columns start stacking no matter the viewport.

Get two columns starting at desktops and scaling to large desktops.

No grid classes are necessary for full-width elements.

Per the documentation, nesting is easy—just put a row of columns within an existing column. This gives you two columns starting at desktops and scaling to large desktops, with another two (equal widths) within the larger column.

At mobile device sizes, tablets and down, these columns and their nested columns will stack.

The Bootstrap 3 grid system has four tiers of classes: xs (phones), sm (tablets), md (desktops), and lg (larger desktops). You can use nearly any combination of these classes to create more dynamic and flexible layouts.

Each tier of classes scales up, meaning if you plan on setting the same widths for xs and sm, you only need to specify xs.

Clear floats at specific breakpoints to prevent awkward wrapping with uneven content.

Reset offsets, pushes, and pulls at specific breakpoints.

To learn about the grid system of Bootstrap, you can click here. The article focuses on the Bootstrap-3 col-xs grid class.

Grid Classes: The bootstrap-3 grid system has four classes, which are mentioned below:

Components of a grid system: Some of the components of the grid system are:

.xs-grid class: The bootstrap-3 grid system provides this class, which allows us to design a user interface for devices whose screen sizes is less than 768px.

Syntax:

Properties:

Example 1: Using col-xs-4

The following code demonstrates the use of col-xs-4, which takes up 1/3 of the screen when the screen width is less than 768px.

Output:

Example 2: Using col-xs-6

The following code demonstrates the use of col-xs-6, which takes up 50% of the screen when the screen width is less than 768px.

Output:

In bootstrap-4 and bootstrap-5, the col-xs class has been removed and replaced with col. For example:

Web browser used:

Reference: Click here to learn more about Bootstrap.

Below we have collected some examples of basic Bootstrap grid layouts.

The following example shows how to get a three equal-width columns starting at tablets and scaling to large desktops. On mobile phones, the columns will automatically stack:

The following example shows how to get a three various-width columns starting at tablets and scaling to large desktops:

The following example shows how to get two various-width columns starting at tablets and scaling to large desktops:

Use the .row-no-gutters class to remove the gutters from a row and its columns:

The following example shows how to get two columns starting at tablets and scaling to large desktops, with another two columns (equal widths) within the larger column (at mobile phones, these columns and their nested columns will stack):

The Bootstrap grid system has four classes: xs (phones), sm (tablets), md (desktops), and lg (larger desktops). The classes can be combined to create more dynamic and flexible layouts.

Tip: Each class scales up, so if you wish to set the same widths for xs and sm, you only need to specify xs.

Clear floats (with the .clearfix class) at specific breakpoints to prevent strange wrapping with uneven content:

Move columns to the right using .col-md-offset-* classes. These classes increase the left margin of a column by * columns:

Change the order of the grid columns with .col-md-push-* and .col-md-pull-* classes: