use boostrap grids in html code example

Example 1: boot strap columns

  

    

      1 of 3
    
    

      2 of 3 (wider)
    
    

      3 of 3
    
  
  

    

      1 of 3
    
    

      2 of 3 (wider)
    
    

      3 of 3
    
  

Example 2: bootstrap grid class

col-12 col-sm-4 col-md-3 col-lg-12	col-xl-12