css validator help

    when using the css validator, i got this response... what i dont 
understand is, how can i say i have no background-color, when inside my 
stylesheet, i specifically say "background-color : #999999 ;" or 
whatever... your help is appreciated...


    Warnings


      URI : file://localhost/TextArea

    * Line : 77 Level : 1 You have no color with your background-color :
      .navBox
    * Line : 91 Level : 1 You have no color with your background-color :
      .contentBox


    Valid CSS informations

    * BODY {
          * font-family : Verdana, Geneva, Arial, Helvetica, sans-serif;
          * font-size : 10px;
          * text-align : center;
          * border : 3px solid black;
          * margin-bottom : 20px;
          * margin-left : 0;
          * margin-right : 0;
          * margin-top : 0;
          * color : white;
          * background-color : #cccccc;
          * background-image : url(bg.gif) ;
          * background-repeat : no-repeat ;
          * background-attachment : fixed ;
      }
    * A {
          * color : #cccc99;
          * background-color : #999999;
      }
    * A:hover {
          * color : red;
          * background-color : #999999;
      }
    * H1 {
          * font-size : 20px;
          * font-variant : small-caps;
          * font-weight : bolder;
          * font-style : italic;
      }
    * H2 {
          * font-size : 16px;
          * font-style : italic;
          * font-variant : small-caps;
          * font-weight : bold;
      }
    * .headerBox {
          * margin-top : 15px;
          * margin-bottom : 15px;
      }
    * IMG {
          * border : 3px solid #999999;
      }
    * .mainBox {
          * border : 5px solid #999999;
          * margin-top : 95px;
          * margin-bottom : 60px;
          * padding-bottom : 40px;
          * width : 591px;
      }
    * .navBox {
          * border : 3px solid ;
          * margin-left : -3px;
          * margin-right : -3px;
          * height : 19px;
          * padding-bottom : 5px;
          * padding-top : 3px;
          * background-color : #999999;
      }
    * .contentBox {
          * text-align : justify;
          * text-indent : 21px;
          * border : 3px solid ;
          * margin-left : 30px;
          * margin-right : 30px;
          * margin-top : 25px;
          * padding-bottom : 20px;
          * padding-left : 30px;
          * padding-right : 30px;
          * padding-top : 10px;
          * background-color : #999999;