Why it is not working?

Question

#intro .del{ color:pink
*/ this is a comment */
background-color:red

Answer 1

You should finish with a semicolon after every instruction ( ;) that is after pink and red.cloze with( } )

Answer 2

Thx

Answer 3

Like this

But not working
#intro .del{
color:red;
/* this is a comment */
background-color:green;
}

Answer 4

Md Samir you are missing "," in between #intro and.del.