Can't use bootstrap Responsive utilities

[benalta64]

Hello !
I'm having trubles to use those kind of classes :

.hidden-xs-down, .hidden-xs-up ...

Please help me out !

Kind regards

[schmidt1024]

It seems that the classes you use are obsolete. Check out the alpha(1) and the beta(2) docs.

(1) https://v4-alpha.getbootstrap.com/layout/responsive-utilities/
(2) https://getbootstrap.com/docs/4.0/layout/utilities-for-layout/