How to use the new theme on an addon?

[cx42net]

Hi everyone!

I started working on my addon and noticed that the form design wasn't the same as the fields in the forms elsewhere in Prestashop (like Add a new client, Add a new category, etc). (this for 1.7.6.0)

I noticed that in these other pages, the css loaded is "new-theme" whereas my addon is loading "default".

Is there a way to use the new theme without breaking the page?

I tried setting setMedia(true), but all the addon rendering is broken then.

 

Thank you for your help.