weseek__growi/resource/styles/scss/_mixins.scss

@mixin variable-font-size($basesize) {
  font-size: $basesize;
  @media(max-width: $screen-lg) {
    font-size: #{$basesize * 0.9};
  }
  @media(max-width: $screen-md) {
    font-size: #{$basesize * 0.8};
  }
  @media(max-width: $screen-sm) {
    font-size: #{$basesize * 0.7};
  }
  @media(max-width: $screen-xs) {
    font-size: #{$basesize * 0.6};
  }
}