CKEditor hide table border

Question

I have full-page CKEditor, which is use to edit my Invoices. My CSS have table border property, and I can see it when load HTML source directly in browser. But CKEditor hide it after open! I even see how it blinks for one second, than fade. Anybody faced with such problem?

Here example of my invoice: http://jsbin.com/ludicohuxe/edit?html,output

table, td, th {
  border: 1px solid black;
  border-collapse: collapse;
  text-align: center;
  }  

  td {
  padding: 1em;
  }

Answer 1

This works:

border: 1px solid black !important;