No mobile change in form

Hello!

I installed this plugin to customize a form in gravity forms. I can change font size of a title section break in desktop, but not in tablet or mobile. I don’t see the preview in mobile and tablet but I see it in desktop.

I have the last version of style and layout for gravity form. Almost last version of WP and my theme is Logistic.

I find my answer by my self when I search for the theme name. I edited the theme so I can find where was my error. The CSS overpassed the plugin I think.

So this is no more a support question but if it can help a someone ?? !

Have good web developping!