<!DOCTYPE html>
<html>
<head> 
<style>                                
div {
    background-color:lime;
    display: block;
    padding: 10px;
    position: relative;
    left: -430px;
    width: 860px;
    height:100px;
    margin-left: 50%;
}
</style>
</head>
<body>
<div></div>
</body>
</html>