body {
    margin: 8px auto;
    width: 980px;
    background-color: #fee;
}

main {
    width: 70%;
    float: left;
    background-color: #ddd;
}

article {
    padding: 1em;
}

aside {
    width: 30%;
    float: left;
    background-color: #ccc;
}