Hiding the Mobile Nav Bar on a Single Page with Page Header Code Injection

I have already been able to remove the nav bar from the desktop site using

<style> #header { display: none } </style>

Now I just cannot find anywhere on the internet how to hide the mobile nav bar on a single page.

Thanks!

- portraitflow.com

<style>
  .mobile-bar-wrapper {
    display: none;
}
</style>