Style Sheets........

Style Sheets........

  
Hi All,
i want to customize the CommonSideBar,i add a table widget In CommonSideBar and wrote a css style for table,
which is below....
but no effect....when i closed the style sheet editor it remain empty,no style applies........
missing some thing, plz figure out me......

table_ {
font-family: 'Times New Roman';
font-size: x-large; font-weight: normal;
font-style: normal; font-variant: normal;
text-transform: capitalize; color: #FFFFFF;
text-align: center; word-spacing: normal;
background-color: #0000FF
}