DIV#contenedor
{
    margin: 0px;
    width: 700px;
    height: 700px;
}

DIV#superior
{
    margin: 0px;
    background: black;
    width: 650px;
    height: 50px;
    float: right;
}

DIV#izquierda
{
    margin: 0px;
    background: black;
    width: 50px;
    height: 700px;
}

DIV#contenido
{
    margin: 0px;
    border: none;
    float: right;
    width: 640px;
}