roll20-character-sheets/backbone/source/assets/scss/placeholders/_hidden.scss

//- Styling to hide elements
%hidden{
  display: none!important;//!important is usually a thing to avoid, but if we're applying this, we want it to be gone no matter what.
}
%hideBase{
  .sheet-hidden,
  .hidden,
  *[hidden]{
    @extend %hidden;
  }
}