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What is Bootstrap 4 Grid System ?


Bootstrap grid systems provide the rapid and effortless way to design responsive website layouts. As dissimilar to the earlier Bootstrap 2.x grid system which are fix by default, the new version, i.e. Bootstrap 4 introduce the responsive mobile original fluid grid system that correctly balance up to 12 columns as the tool or viewport size increases.


Bootstrap 4 include predefined grid classes for instantly making grid layouts for various types of devices like cell phones, tablets, laptops and desktops, etc. For example, you can use the .col-xs-* class to create grid columns for small devices like cell phones, similarly the .col-sm-* class for small screen devices like tablets, the .col-md-* class for average size devices like desktops and the .col-lg-* for big desktop screens. The following table summarizes some of the important features of the latest grid system



Bootstrap 3 Grid System

Extra small devices

Phones (<768px)

Small devices



Medium devices

Desktops (≥992px)

Large devices



Max container width None (auto) 750px 970px 1170px
Grid behavior

Horizontal at all


Collapsed to start, horizontal above


Class prefix .col-xs- .col-sm- .col-md- .col-lg-

Max column


Auto ~62px ~81px ~97px
Gutter width 15px on each side of a column


Above table show one key point, applying any .col-sm-* class to an section will not only affect its style on small devices, but also on medium and large devices having a screen size superior than or equivalent to 768px (i.e. ≥768px) if .col-md-* and .col-lg-* class is not exhibit. Equally the .col-md-* class will not only affect the style of element on average devices, but also on big devices if a .col-lg-* class is not present.

Now the question arise how to design rows and columns by this 12 column responsive grid system. The answer is very easy, at first form a container that act as a packaging for your rows and columns using the .container class, after that build rows inside the container using the .row class, and to build columns within any row you can apply the class.col-xs- *, .col-sm-*, .col-md-* and .col-lg-*. The columns are actual content area where we will place our contents. Hope this information is useful for you.  We’ll be sharing more information regarding the same in our upcoming posts.

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