The biggest difference between bootstrap 3 and bootstrap 4 is that bootstrap 4 now uses flexbox instead of floats to handle the layout.
Gutter space in bootstrap 4.
This way all the content in your columns is visually aligned down the left side.
Bootstrap s grid system uses a series of containers rows and columns to layout and align content.
In the case of the sm grid your container class will 970px 940px grid gutter width.
The flexible box layout module makes it easier to design flexible responsive layout structure without using float or positioning.
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In bootstrap 4 there are 12 columns in the grid system each column has a small space in between that space is known as gutter space.
Gutter space has width 30px 15px on each side of a column.
Every column get a width of 940 12.
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.
This way all the content in your columns is visually aligned down the left.
Let s assume it s 30px here.
Gutters are the white space between columns.
The following approach will explain clearly.
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.
Each column has horizontal padding called a gutter for controlling the space between them.
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If you are new to flex you can read about it in our css flexbox tutorial.
This padding is then counteracted on the rows with negative margins.
Rows are wrappers for columns.
How to remove gutter space between columns in bootstrap 3.
Bootstrap 4 grid examples.
Add the no gutters class to the row container to remove gutters extra space.
The default bootstrap grid system utilizes 12 columns with each span having 30px gutter as below.
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This gutter is build with 15px padding of the column 15 px resting grid space.
