body {
 margin: 0; 
 padding: 0;
 background: #e4e9ec;
}

#container1 {
 width: 900px;
}

#container2 {
 width: 900px;
}

#container3 {
 width: 900px;
}

#content {
 background: red;
 margin: 0 5px 0 5px;
 min-height: 1050px;
}

#menu {
 margin: 50px auto;
 border:1px solid #000000;
}