Grid


Bootstrap grid includes a responsive, mobile first fluid grid system that appropriately scales up to 12 columns as the device or viewport size increases. It includes predefined classes for easy layout options, as well as powerful mixins for generating more semantic layouts

Introduction

Grid systems are used for creating page layouts through a series of rows and columns that house your content. Here's how the Bootstrap grid system works:

  • You must start with row
  • There are pre-define classes of columns starting from 1 to 12, example col-md-1 to col-md-12
  • Each of these value represent a percentage of the screen, 1 being the smallest and 12 being 100%
  • You can create different grid pattern that finally forms 12
  • example :

    <div class="row">
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
      <div class="col-md-1">.col-md-1</div>
    </div>
    <div class="row">
      <div class="col-md-8">.col-md-8</div>
      <div class="col-md-4">.col-md-4</div>
    </div>
    <div class="row">
      <div class="col-md-4">.col-md-4</div>
      <div class="col-md-4">.col-md-4</div>
      <div class="col-md-4">.col-md-4</div>
    </div>
    <div class="row">
      <div class="col-md-6">.col-md-6</div>
      <div class="col-md-6">.col-md-6</div>
    </div>

  • There different grids for different screen sizes, "col-md" md stands for medium screen, the following table explains
  • Extra small devices Phones (<768px) Small devices Tablets (≥768px) Medium devices Desktops (≥992px) Large devices Desktops (≥1200px)
    Grid behavior Horizontal at all times Collapsed to start, horizontal above breakpoints
    Container width None (auto) 750px 970px 1170px
    Class prefix .col-xs- .col-sm- .col-md- .col-lg-
    # of columns 12
    Column width Auto ~62px ~81px ~97px
    Gutter width 30px (15px on each side of a column)
    Nestable Yes
    Offsets Yes
    Column ordering Yes