Bootstrap grid won't work using xs columns

Question

I started a new project on Codepen and I\'m using bootstrap.. It\'s been a while since I worked CSS. The grid sistem is not responding for me, I can\'t find the problem. I e

Answer 1

The pen is using Bootstrap 4, and the CSS class names have changed. The xs infix has been removed in 4.x...

col-xs-offset-3 is now offset-3
col-xs-6 is now col-6

  

    

      

      
FFC Calculator
 
      
    
  

http://codepen.io/anon/pen/JNyqWX