body {
    background-color: #312e2e;
}

main, 
header, 
footer {
    margin: 0 auto;
    max-width: 60%;
    p {
        font-size: 2rem;
    }
}

h1,
footer p {
    font-size: 3rem;
    color: white;
}

.main-container {
    color: green;
    .blue-p {
        color: blue;
    }
    .orange-p {
        color: orange;
    }
    .yellow-p {
        color: yellow;
    }
}