Ho questa serie di Warning nella validazione del Css (Dtd=html strict).
Perchè? Ad esempio, la Line 3 (vedi sotto) il background ce l'ha!!
codice:
html, body {
  margin: 0px 0px 0px 0px;
  background-color: #ffffff;
  padding: 0px;
  text-align: center;
}

Questi sono i Warning...
codice:
    * Line : 3 (Level : 1) You have no color with your background-color : body
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 10 (Level : 1) You have no background-color with your color : h4
    * Line : 34 (Level : 1) You have no color with your background-color : #main
    * Line : 42 (Level : 1) You have no color with your background-color : #head
    * Line : 60 (Level : 1) You have no background-color with your color : #sx
    * Line : 88 (Level : 1) You have no background-color with your color : #footer a
    * Line : 93 (Level : 1) You have no background-color with your color : a.credits
    * Line : 99 (Level : 1) You have no color with your background-color : #menu
    * Line : 135 (Level : 1) You have no background-color with your color : #menu a
    * Line : 153 (Level : 1) You have no background-color with your color : h1
    * Line : 163 (Level : 1) You have no background-color with your color : h2
    * Line : 179 (Level : 1) You have no background-color with your color : a