html {
  font-size: 62.5%; /* 10px */
  font-weight: 500;
  font-optical-sizing: auto;
  font-style: normal;
}

@media only screen and (min-width: 2500px) {
  html {
    font-size: 85% !important;
  }
}

@media only screen and (max-width: 1600px) {
  html {
    font-size: 62.5% !important;
  }
}

@media only screen and (max-width: 1400px) {
  html {
    font-size: 50% !important;
  }
}

@media only screen and (max-width: 768px) {
  html {
    font-size: 62.5% !important;
  }
}

@media only screen and (max-width: 320px) {
  html {
    font-size: 50% !important;
  }
}