Problemas con CSS

[jmb0286]

#contenedor {
background-color: #333333;
height: 855px;
width: 800px;
margin-top: 0px;
margin-right: auto;
margin-bottom: 0px;
margin-left: auto;
font-weight: bold;
color: #FFFFFF;
}

#horafecha {
background-color: #666666;
height: 20px;
width: auto;
font-weight: bold;
color: #FFFFFF;
margin-top: 15px;
margin-right: 15px;
margin-left: 15px;


}

#toolslogreg {
background-color: #999999;
height: 20px;
width: auto;
font-weight: bold;
color: #FFFFFF;
margin-right: 15px;
margin-left: 15px;

}

#cabecera {
background-color: #003333;
height: 150px;
width: auto;
font-weight: bold;
color: #FFFFFF;
margin-right: 15px;
margin-left: 15px;

}

#menuprincipal {
background-color: #003366;
height: 30px;
width: auto;
font-weight: bold;
color: #FFFFFF;
margin-right: 15px;
margin-left: 15px;

}

#noticiasindex {
background-color: #009966;
float: left;
height: 400px;
width: 385px;
font-weight: bold;
color: #FFFFFF;
margin-left: 15px;
background-image: url(../imagenes/html/ultimas_noticias.png);
background-repeat: no-repeat;

}

#videosindex {
background-color: #009966;
float: right;
height: 400px;
width: 385px;
font-weight: bold;
color: #FFFFFF;
margin-right: 15px;
background-image: url(../imagenes/html/ultimos_videos.png);
background-repeat: no-repeat;

}

#fotosindex {
background-color: #009966;
height: 150px;
width: 770px;
font-weight: bold;
color: #FFFFFF;
margin-right: 15px;
margin-left: 15px;
float: left;
background-image: url(../imagenes/html/ultimas_fotos.png);

}

#loginindex {
background-color: #FF3366;
height: 35px;
width: 770px;
font-weight: bold;
color: #FFFFFF;
margin-right: 15px;
margin-left: 15px;
float: left;
background-image: url(../imagenes/html/login.png);

}

#copyright {
background-color: #666666;
height: 20px;
width: 770px;
font-weight: bold;
color: #FFFFFF;
margin-right: 15px;
margin-left: 15px;
margin-bottom: 15px;
float: left;

}