Well, wow lol... Ok...
Look at the source of this page; class="" is shown all over; so thats the specific class for that section, and it's nested in another class, or table, or whatnot it shows another class...
Well, since you want to specify a certain area as to not mess with the option globally, you'd try to specify it out as clear as possible; so we do that in this case as what I posted above; go view the source of this page and search for "manage topic" and it shows the classes of that cell, and the table it's nested in; which is how i reached to what i posted above.
There are other things to update to, if it's a table you can use "table", break can be "br", etc.
They have to be prefixed as:
id - #id
class - .class
tag - tag
