.Header
{
border: 5px solid black;
background: white;
padding: 10px;
}

.Main
{
border: 3px solid black;
background: white;
width: 500px;
height: 600px;
padding: 10px;
position: absolute;
top: 200px;
left:250px;
}

.Leftlinks
{
border: 2px solid black;
background: white;
width: 200px;
height: 400px;
padding: 5px;
position: absolute;
top: 200px;
left: 25px;
}