html,body{
margin:0;
padding:0;
background-image: url(imag/fondo.gif); 
background-repeat: no-repeat;}

body{
font: 76% arial,sans-serif;
text-align:center}

p{margin:15px 15px 15px 15px;
color:#5b5b5b;
text-align:justify;
}

a{padding:5px;
text-decoration:none;
color:#000000;}

div#header{
background-color:#F3F2ED;
background-image: url(imag/header.gif);
height:108px;
width: 995px;}

div#header h1{height:80px;
line-height:80px;
margin:0;
padding-left:10px;}

div#blogs{
height:108px;
width: 100px;
float:right;}

div#unlp{
height:108px;
width:160px;
float:right;
margin-right:10px;
}

div#unlp a{
font:95% arial,sans-serif;
font-weight:bold;
text-align:right;
color:#ffffff;
}

div#unlp a:hover{
color:#f79426;
}

div#talleres{
background-color:#F3F2ED;
background-image: url(imag/talleres.gif);
height:35px;
width: 995px;}

div#talleres.table{
background-color:#F3F2ED;
background-image: url(imag/talleres.gif);
height:35px;
width: 995px;}

div#container{
text-align:left;
width:995px;
margin:0 auto;
float:center;}

div#content p{line-height:1.4; width:}

div#content h1{
font: 100% arial,sans-serif;
font-weight: strong;
color:#B05800;
margin:5px 5px 5px 5px;
line-height:15px;
margin:0;
padding-top:10px;
padding-left:15px;
padding-bottom:10px;
text-align:left;
}

div#content h2{
font: 130% arial,sans-serif;
font-weight: strong;
color:#B05800;
margin:5px 5px 5px 5px;
line-height:normal;
margin:0;
padding-top:10px;
padding-left:15px;
padding-bottom:10px;
text-align:left;
}

div#content{
float:left;
width:845px;
border: 1px solid #bbbdbf;}

div#navigation ul{
float:right;
margin:0px 0;
padding:0;
list-style-type:none;}

div#navigation li{
margin-bottom:5px;
}

div#navigation li a:hover{
margin-bottom:5px;
width:77px;
display:block;
color:#ffffff;
background-color:#bbbdbf;}

div#navigation{
margin-bottom:5px;
float:left;
height:400px;
width:147px;
background-color:#FFFFFF;}

div#retros{
margin-bottom:5px;
float:right;
height:113px;
width:125px;
background-color:#FFFFFF;}

div#extra{background:#CCC8B3;}

div#extra{
float:right;
width:500px}

div#footer{
margin-left:147px;
clear:both;
width:848px;
height:15px;
border-top:6px;
border-top-style:solid;
border-top-color:#ffffff;
background:#f79426}

div#footer p{
size:40%; font-family:Arial, Helvetica, sans-serif;
color:#FFFFFF;
font-weight:bold;
text-align:center;
margin:0;
}

<div align="center"></div>