Cover page custom font for buttons

Add to Cover Page Header

<style>
  * {
    font-family: 'GTSuperDisplay-Medium' !important;
}
</style>

Thanks this seems to change all fonts on the cover page. I'm wanting to do one font for the headings and one font for the buttons. Is this possible?

<style>
  h1#sqs-slash-page-header {
    font-family: 'GTSuperDisplay-Medium' !important;
}
</style>

I don't see button?