CSS Design: News horizontaler Scollbalken

...
...
height:514px;
....
....
overflow: auto; }

float: left; / float: right;

#container {
margin: 0 auto;
width: 900px;
}
#header {
float: left;
height: 100px;
width: 900px;
background-color: #353535;
}
#nav {
float: left;
height: 40px;
width: 900px;
background-color: #888888;
}
#sidebar_container {
float: left;
height: 100px;
width: 200px;
background-color: #535353;
}
#content{
float: left;
height: 100px;
width: 700px;
background-color: #353535;
}
#container_end {
clear: both;