body {
    font-family: 'Arial', sans-serif;
    background-color: #f8f9fa;
    margin: 0;
    padding: 0;
}

#container {
    max-width: 900px;
    margin: 40px auto;
    border: 3px solid #adb5bd;
    border-radius: 10px;
    background-color: #ffffff;
    padding: 15px;
}

header {
    background-color: #dc3545;
    color: white;
    padding: 30px;
    text-align: center;
}

main {
    padding: 20px;
}

aside {
    background-color: #f1f1f1;
    padding: 15px;
    margin-top: 15px;
}

aside h2 {
    margin-top: 0;
}

footer {
    background-color: #6c757d;
    color: white;
    text-align: center;
    padding: 10px;
}