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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.
|Max container width||None (auto)||540px||720px||960px||1140px|
|# of columns||12|
|Gutter width||30px (15px on each side of a column)|
Grid classes apply to devices with screen widths greater than or equal to the breakpoint sizes, and override grid classes targeted at smaller devices. Therefore, applying any
.col-md- class to an element will not only affect its styling on medium devices but also on large devices if a
.col-lg- class is not present.
How it works 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.
.containerfor a responsive pixel width or
width: 100%across all viewport and device sizes.
padding(called a gutter) for controlling the space between them. This
paddingis then counteracted on the rows with negative margins. This way, all the content in your columns is visually aligned down the left side.
widthwill automatically layout as equal width columns. For example, four instances of
.col-smwill each automatically be 25% wide from the small breakpoint and up. See the auto-layout columns section for more examples.
widths are set in percentages, so they’re always fluid and sized relative to their parent element.
paddingto create the gutters between individual columns, however, you can remove the
marginfrom rows and
paddingfrom columns with
.col-sm-4applies to small, medium, large, and extra large devices, but not the first
.col-4) or Sass mixins for more semantic markup.
Bootstrap version 4.1.3