YouTube Full Theater by ibillingsley

/* ==UserStyle==
@name           YouTube Full Theater
@namespace      github.com/ibillingsley
@version        1.0.6
@description    Full screen theatre mode for YouTube
@author         Isaiah Billingsley
@homepageURL    https://github.com/ibillingsley/userstyles
@license        0BSD
==/UserStyle== */

@-moz-document url-prefix("https://www.youtube.com/watch") {
  /* Full height player */
  ytd-watch-flexy[theater] #player-wide-container,
  ytd-watch-flexy[theater] #player-theater-container,
  ytd-watch-flexy[theater] #full-bleed-container {
    max-height: 100vh !important;
    min-height: 100vh !important;
  }
  /* Hide top bar */
  #masthead[theater] {
    height: 0 !important;
    opacity: 0 !important;
    transition: opacity 0.1s ease-in-out !important;
  }
  /* Show on hover */
  #masthead[theater]:hover {
    opacity: 1 !important;
  }
  /* Remove top margin */
  #masthead-container {
    position: sticky !important;
  }
  #page-manager {
    margin-top: 0 !important;
  }
}