I'm using google page speed and it's telling me my css is inefficient...

Very inefficient rules (good to fix on any page):

* table.fancy thead td    Tag key with 2 descendant selectors and Class overly qualified with tag
* table.fancy tfoot td    Tag key with 2 descendant selectors and Class overly qualified with tag

The css rules are

table.fancy {border: 1px solid white; padding:5px}
table.fancy td {background:#656165}
table.fancy thead td, table.fancy tfoot td {background:#767276}

I want the header and footer in a different background color than the body of the table (a data table)

• On what grounds this is inefficient?
• How to make it more efficient?

I will not add a class to the thead and tfoot for googles's sake.