Some default CSS breakpoints inspired by common device resolutions

breakpoints.css

@media (min-width: 640px) {
    /* Small */
}

@media (min-width: 768px) {
    /* Medium */
}

@media (min-width: 1024px) {
    /* Large */
}

@media (min-width: 1280px) {
    /* Extra Large */
}