html, body {
  height: 100%;	
}

body {     
  margin:0;
  padding:0; 
  font-family: arial;
  font-size: 12px;
  background: url('../imagens/fundo.png') repeat-x #e54826;  
}

#principal {
  position: relative;
  width: 980px;
  margin: 0 auto;
}