Xs for phones screens less than 768px wide.
Grid system gutter.
The classes above can be combined to create more dynamic and flexible layouts.
Sm for tablets screens equal to or greater than 768px wide.
Resulting in a 30px gutter between columns plus 15px to the left and right of the grid.
Bootstrap s grid system uses a series of containers rows and columns to layout and align content.
The standard bootstrap grid is a 12 column layout with a 15px margin on each side of the column.
These gutters are highly reminiscent of the css grid gap property.
Since this grid system is powered by flexbox and not css.
Gutter grid is a flexbox based grid system for building fully responsive grid layouts with highly customisable gutters.
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.
It contains 5 types of media breakpoints that are used for targeting specific screen sizes or orientations xs sm md lg and xl these resolutions are defined below in the viewport breakpoints table and can be modified by customizing the breakpoint service.
The bootstrap grid system has four classes.
Md for small laptops screens equal to or greater than 992px wide.
Lg for laptops and desktops screens equal to or greater than 1200px wide.