Markdown menu font resize for mobile

Site URL: http://www.glossi.io

Hi all,

Can someone tell me how to resize the font on a markdown menu for mobile? The specific section I am trying to resize are the questions in "Frequently Asked Questions." (photo attached)

Thanks 

Jonathan

Add to Page Settings > Advanced > Header

<style>
  @media screen and (max-width:767px) {
  .markdown-block h2 {
    font-size: 10px;
}
  }
</style>