/* Mobile first approach */
body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
}

/* For tablets and up */
@media (min-width: 768px) {
    body {
        font-size: 18px;
    }
}

/* For desktops */
@media (min-width: 1024px) {
    body {
        font-size: 20px;
    }
}