Refer to bloc in css

I Need Help
1

I’m trying to stack some blocs with the z-index such that when a point in the page is reached the bloc is shown. How do I refer to the bloc in css? I know that for a div it is div.class.

Is it bloc.class? Not sure if I’m referring to the convention wrong or if it is wrong approach.

2

You are able to give each bloc a unique ID inside the settings. Then you are able to target that ID with

#id {

}

for your CSS changes.