body {
    width: 75%;
    margin: 0 auto;
}

header, nav, main, section, aside, footer {
    padding: 5px;
    margin-top: 10px;
}

section, aside {
    float: left;
}

nav > a{
    text-decoration: none;
    font-size: 20px;
}

section {
    width: 70%
}
aside {
    width: 20%;
}

footer {
    clear: both;
}