/* Root REM fluid scale */
html { font-size: 16px; }

/* Scale from 1440px down proportionally */
@media (max-width: 1440px) {
  html { font-size: calc(16px * (100vw / 1440)); }
}

/* Continue proportional scale below 992px based on 992 baseline */
@media (max-width: 992px) {
  html { font-size: calc(16px * (992 / 1440) * (100vw / 992)); }
}