body {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    font-family: sans-serif;
    line-height: 1.6;
    color: #333;
    display: flex;
    gap: 20px;
    min-height: 100vh; 
}

aside {
    width: 120px;
    position: fixed; 
    left: 40px;      
    top: 50%;            
    transform: translateY(-50%);
}

main {
    flex-grow: 1;
}

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

nav a {
    display: block;
    padding: 5px 0;
    text-decoration: none;
    color: #000;
}

@media (max-width: 600px) {
    body {
        flex-direction: column;
    }

    aside {
        position: static; 
        transform: none;  
        width: 100%;
        border-bottom: 1px solid #ccc;
        margin-bottom: 20px;
    }
}