body {
    background-color: #000;
    background-image: url("images/sidebar.png");
    background-repeat: no-repeat;
}

.header {
    width: 800px;
    float: left;
    background-color: #000;
    background-image: url("images/sidebar.png");
    background-repeat: no-repeat;
}

.navigation {
    width:800px;
    background-color: #000;
    background-image: url("images/sidebar.png");
    background-repeat: no-repeat;
    position: absolute;
    left: 0px;
    top: 45px;
}