$maxWidth: 1280;
@mixin adaptive-font($pcSize, $mobSize) {
  $additionSize: $pcSize - $mobSize;
  $additionMobSize: $additionSize + $additionSize * 0.7;
  //  for all screen width less than 767px(iPad)
  @media (max-width: 767px) {
    font-size: calc(#{$mobSize + px} + #{$additionMobSize} * ((100vw - 350px) / #{$maxWidth}));
  }
  // for all screen width more than 767px
  @media (min-width: 767px) {
    font-size: calc(#{$mobSize + px} + #{$additionSize} * (100vw / #{$maxWidth}));
  }
}