I've just started editing the custom CSS for the first time, to be able to style some pages just a bit more to my liking.

However, this messes with the mobile layout (I'm just adding a div class via the WYSIWYG html).

Does anyone know how to make sure a class doesn't affect what happens on mobile?

Put the custom CSS inside a block like:

@media screen and (min-width:768px)
{
	blah
}

 

Thanks a bunch!