Heading with fluid font-size

25px

Heading no fluid font-size

150px

#top .av-special-heading.fluid-font .av-special-heading-tag {
  font-size: min(max(25px, calc(1.5625rem + (150 - 25) * ((100vw - 320px) / (1500 - 320)))), 150px);
  min-height: 0vw;
}