[SOLVED] Change background color of individual widgets

I want to change the background color of each individual widget
I use to do this in "insert CSS":

#categoryposts-4 {
background: #99FFCC;
{
#text-6 {
background:#CCFFCC;
{
#categoryposts-5 {
background:#FFFFCC;
{


But only the first of the list has a background that changes color.
If I put text-6 (or categoryposts-5 and so on ..) at the top of the list, it changes color but not for others.
What grammatical error css did I?

Thanks


Ata 3.7.1
WP 3.2.1