.container {
margin-left:auto;
margin-right:auto;
width:940px;
position:relative;
}
.col1,.col2,.col3,.col4 {
float:left;
}
.col1 {
width:300px;
}
.col2 {
width:620px;
}
.col3 {
width:380px;
}
.col4 {
width:540px;
}