body {
    margin: 0; 
    padding: 0; 
}

header {
    background: #555; 
    color: white; 
    width: 100%; 
    text-align: center; 
    font-size: 300%; 
}

.container {
    display: flex; 
    justify-content: center; 
}

menu {
    width: 300px; 
    background: #ccc; 
    order: 1; 
}

section.extras {
    width: 200px; 
    border-left: 1px solid red; 
    order: 3; 
}

main {
    width: 480px; 
    order: 2; 
}

footer {
    background: black; 
    font-weight: bold; 
    color: white; 
    text-align: center; 
}