I created my module as Responsive. I use LondonFixed Theme.
Now, I think it is better to have non responsive webscreens.
How can I change that?

I want to see the same in desktop and mobile.

I tried to edit the css, but no effect...
Hi Mara,

Responsive CSS classes are present in the London base theme (using CSS @media queries). If you do not wish responsive behavior you need to create your own theme without these classes.

An alternative would be to have a layout web block in all your screens without the Responsive class (instead of using the Layout_London).

Tiago Simões