body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #333;
    color: #fff;
}

header {
    display: flex;
    flex-direction: row;
    text-align: center;
}

header, footer {
    background-color: #222;
    color: white;
    padding: 10px 20px;
}

header ul, aside ul {
    list-style: none;
    padding: 0;
}

header ul li, aside ul li {
    display: inline;
    margin-right: 20px;
}

header a, aside a, main a {
    color: #4fa;
    text-decoration: none;
}

aside {
    background-color: #444;
    padding: 20px;
    width: 200px;
    float: left;
}

main {
    /* margin-left: 220px; */
    color: #1c7;
    padding: 20px;
}

article {
    background-color: #555;
    padding: 20px;
    border-radius: 5px;
}

article a {
    color: #3ae;
}

footer {
    clear: both;
}

footer a {
    color: #4fa;
}