set bootstrap col witdh from css code example

Example 1: no-gutter bootstrap 4

  
.col-12 .col-sm-6 .col-md-8
  
.col-6 .col-md-4

Example 2: boot strap columns

  

    

      1 of 3
    
    

      2 of 3 (wider)
    
    

      3 of 3
    
  
  

    

      1 of 3
    
    

      2 of 3 (wider)
    
    

      3 of 3