body > header, body > main, body > footer {
    border: 1px solid red;
    margin: 5px;
    padding: 5px;
}

header > nav, main > article, footer > nav {
    border: 1px dashed black;
    margin: 5px;
    padding: 5px;
}

article > aside {
    border: 1px dotted black;
    margin: 5px;
    padding: 5px;
}