Having trouble in NN with a particular style I reference in my external CSS.

Here is the style attributes:

.contentbanner
{
BACKGROUND-COLOR: #e8f7c2;
COLOR: #94ce00;
FONT-FAMILY: Arial, Tahoma;
FONT-SIZE: 12pt;
FONT-STYLE: normal;
FONT-WEIGHT: bold; padding-left: 5px: 1px #000062 solid;
}

The problem is that in IE this shows a solid background with the desired font etc. but alas NN shows nothing??

Any ideas???