Why flex & grid not working

Hi there,

Is anyone can tell me Y my Flex and Gird doesn’t work ?
I used Bootstrap4

I want to play a little bit with them the get better understanding how they work.
This is my code pen,

It’s not clear what you want to achieve. Fire up the css inspector and you’ll see you’re not even using valid values for flex.

Thanks man it worked! :slight_smile: