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Grid system

Bootstrap 5 Grid system

Bootstrap grid is a powerful system for building mobile-first layouts. It’s very extensive tool with a great number of options. Below we present you the core knowledge. It’s a simplified overview of the most commonly used examples.

Basic 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 in-depth explanation for how the grid system comes together.

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.

Taking it step by step:

Container

Bootstrap requires a containing element to wrap site contents and house our grid system. Without a container, the grid won’t work properly.

Row

Rows create horizontal groups of columns. Therefore, if you want to split your layout horizontally, use .row.

Columns

Bootstrap’s grid system allows up to 12 columns across the page.

How it works

Breaking it down, here’s 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) fir 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 and gutter classes to change the spacing of your content.

• Columns are incredibly flexible. There are 12 template columns available per row, allowing you to create different combinations of elements that span any number of columns. Column classes indicate the number of template columns to span (e.g., col-4 spans four). widths are set in percentages so you always have the same relative sizing.

• Gutters are also responsive and customizable. Gutter classes are available across all breakpoints, with all the same sizes as our margin and padding spacing. Change horizontal gutters with .gx-* classes, verical gutters with .gy-*, or all gutters with .g-* classes. .g-0 is also availble to remove gutters.

• Sass variables, maps, and mixins power the grid. If you don’t want to use the predefined grid classes in Bootstrap, you can use our grid’s source Sass to create your own with more semantic markup. We also include some CSS custom properties to consume these Sass variables for even greater flexibility for you.