[Plugin: WP-Table Reloaded] bold using custom css

I’m trying to bold row 3 and 6 in table 2 (the front page featured cart section) because it is the price I don’t want to use strong commands in the individual cells, because the client wants to edit cells on his own so id rather do custom css
below is the custom css i tried to use but it is not working

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Page in question is here

Thanks!

http://wordpress.org/extend/plugins/wp-table-reloaded/