style.css

nav {
    background: #6E006E;
    width: 800px;
    text-align: center;
}

.nav {
    text-decoration: none;
    color: #FFFFFF;
}

header {
    width: 800px;
    height: 387px;
    background: #FFFFFF;
}

footer {
    width: 800px;
    height: 37px;
    background: green;
}

#wrapper {
    margin: 0 auto;
    text-align: left;
    width: 400px;
}

#content {
    width: 800px;
    height: auto;

    background: #00FF00;
}