* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
    color: #333;
}

header {
    background-color: #004080;
    color: white;
    padding: 1rem;
    text-align: center;
}

nav {
    background-color: #0066cc;
    padding: 0.5rem;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
}

nav ul li {
    margin: 0 1rem;
}

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

main {
    display: flex;
    padding: 1rem;
}

section {
    flex: 2;
    margin-right: 1rem;
}

article {
    background-color: white;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 5px;
    box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

aside {
    flex: 1;
    background-color: #e6e6e6;
    padding: 1rem;
    border-radius: 5px;
}

footer {
    background-color: #004080;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: 1rem;
}