body {
    width: 960px;
    margin: 0 auto;
    padding: 10px;
    font-family: Arial, sans-serif;
}

header, footer {
    border: 1px solid #333;
    padding: 20px;
    margin: 5px 0;
    text-align: center;
    clear: both;
}

nav {
    border: 1px solid #333;
    padding: 10px;
    margin: 5px 0;
    background-color: #f4f4f4;
}

nav ul {
    padding: 0;
    margin: 0;
    list-style-type: none;
}

nav ul li {
    display: inline-block;
    margin-right: 10px;
}

nav ul li a {
    text-decoration: none;
}

section {
    float: left;
    width: 60%;
    border: 1px solid #333;
    padding: 10px;
    margin: 5px 0;
}

aside {
    float: right;
    width: 35%;
    border: 1px solid #333;
    padding: 10px;
    margin: 5px 0;
}

article {
    clear: both;
    border: 1px solid #333;
    padding: 10px;
    margin: 5px 0;
}