Typography 
      grid system
      One of three columns
      One of three columns
      One of three columns
      grid Options
        Extra small
      <576px        		  Small
      竕･576px        		  Medium
      竕･768px        		  Large
      竕･992px        		  Extra large
      竕･1200px  
      Max container width  None (auto)  540px  720px  960px  1140px
      Class prefix  .col-  .col-sm-  .col-md-  .col-lg-  .col-xl-
      # of columns  12
      Gutter width  30px (15px on each side of a column)
      Nestable  Yes
      Column ordering  Yes
      Equal width
        
        1 of 2
        2 of 2
        
        
        1 of 3
        2 of 3
        3 of 3
        
         
      Column
      Column
      Column
      Column
        
        
        1 of 3
        2 of 3 (wider)
        3 of 3
        
        
        1 of 3
        2 of 3 (wider)
        3 of 3
        
      Variable width content
        1 of 3
        Variable width content
        3 of 3
        
        
        1 of 3
        Variable width content
        3 of 3
        
      Responsive classes
      All Break Points
        
      col
        
      col
        
      col
        
      col
        
      col-8
        
      col-4
      Stacked to horizontal
        
      col-sm-8
        
      col-sm-4
        
      col-sm
        
      col-sm
        
      col-sm
      Mix and Match
        
      .col-12 .col-md-8
        
      .col-6 .col-md-4
        
      .col-6 .col-md-4
        
      .col-6 .col-md-4
        
      .col-6 .col-md-4
        
      .col-6
        
      .col-6
      Alignment
       Vertical Alignment 
        
        One of three columns
        One of three columns
        One of three columns
        
        
        One of three columns
        One of three columns
        One of three columns
        
        
        One of three columns
        One of three columns
        One of three columns
        
          
        One of three columns
        One of three columns
        One of three columns
        
        
       Horizontal Alignment 
        
        One of two columns
        One of two columns
        
        
        One of two columns
        One of two columns
        
        
        One of two columns
        One of two columns
        
        
        One of two columns
        One of two columns
        
        
        One of two columns
        One of two columns
        
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