body {
    background-color: #f0f0f0;
    font-family: 'Arial', sans-serif;
    color: #333;
}

header {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 1rem;
}

nav {
    margin: 0;
    padding: 0;
    list-style-type: none;
    background-color: #333;
}

nav li {
    display: inline;
    padding: 10px;
}

nav li a {
    color: white;
    text-decoration: none;
}

article {
    margin-left: 200px;
    padding: 1em;
    overflow: hidden;
}

aside {
    float: left;
    max-width: 200px;
    margin: 0;
    padding: 1em;
    background-color: #f4f4f4;
}

footer {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    position: fixed;
    bottom: 0;
    width: 100%;
    padding: 0.5rem;
}