body {
    background-color: #666666;
}

div#container {
    width: 800px;
    margin: 50px auto 100px auto;
}

header, footer, nav, section {
    margin: 0;
    padding: 20px;
}

header {
    background-color: #999999;
}

footer {
    background-color: #999999;
}

nav {
    background-color: #cccccc;
}

section#main {
    background-color: #ffffff;
}

header h1 {
}

section#main h2 {
}

section#main h3 {
}

section#main img {
}

nav a {
    display: inline-block;
    background-color: #ffffff;
}

nav a:hover {
    color: white;
    background-color: #333333;
}

img{
    max-width: 80%;
    height: auto;
    display: block;
    margin: 10px auto;
}