Sm for tablets screens equal to or greater than 768px wide.
Grid system gutter.
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.
Xs for phones screens less than 768px wide.
The bootstrap 4 grid system has five classes col extra small devices screen width less than 576px col sm small devices screen width equal to or greater than 576px col md medium devices screen width equal to or greater than 768px col lg large devices screen width equal to or greater than 992px col xl xlarge devices screen width equal to or greater than 1200px.
Lg for laptops and desktops screens equal to or greater than 1200px wide.
So reminiscent in fact that that gutter grid gutters will line up perfectly with real css grid gaps.
The standard bootstrap grid is a 12 column layout with a 15px margin on each side of the column.
Since this grid system is powered by flexbox and not css.
The classes above can be combined to create more dynamic and flexible layouts.
Gutter grid is a flexbox based grid system for building fully responsive grid layouts with highly customisable gutters.
Bootstrap s grid system uses a series of containers rows and columns to layout and align content.
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.
The bootstrap grid system has four classes.
Resulting in a 30px gutter between columns plus 15px to the left and right of the grid.