#social_networks_new {
width:760px;
}

#social_box {
width:100%;
}

#social_box_sx {
width:35%;
float:left;
witdth:10em;
margin:0;
}

#social_box_centrale {
width:30%;
float:left;
witdth:10em;
margin:0;
}

#social_box_dx {
width:35%;
float:left;
witdth:10em;
margin:0;
}