css issue

I’m trying to overwrite:

#pf-body tr {
border-bottom: 1px solid #ddd;
}

I created a printfriendly.css and specified the url in the settings. But it’s not overwriting.
– I tried adding !important
– I tried adding body
– added a class to the table

Here is where I am and it’s not working:
#pf-body table.sch tr {border-bottom: 0px solid #fff !important;}