That's the point that one should start paying attention to what they are introducing into the global scope. But it depends on the CSS. A global button class wi

That's the point that one should start paying attention to what they are introducing into the global scope. But it depends on the CSS. A global button class will not overwrite the properties of a button class descending from a higher level class. It will only introduce new properties that are not already defined in the button that's inside the parent scope. There are advantages to having base styles in a global class, but I agree they can get unwieldy if one doesn't have discipline with them.