Full Height Video by mrflix

/* ==UserStyle==
@name         Full Height Video
@version      20230807.09.57
@namespace    ?
==/UserStyle== */

@-moz-document domain("youtube.com") {
ytd-watch-flexy[theater] #player-theater-container.ytd-watch-flexy,
ytd-watch-flexy[fullscreen] #player-theater-container.ytd-watch-flexy,
ytd-watch-flexy[theater] #player-wide-container.ytd-watch-flexy, ytd-watch-flexy[fullscreen] #player-wide-container.ytd-watch-flexy {
  max-height: calc(100vh - 56px);
  height: 100%;
}

.html5-video-player {
  display: flex;
  align-items: center;
}

.html5-video-container {
  width: 100%;
  height: 100%;
}

.html5-video-player .video-click-tracking, .html5-video-player .video-stream {
  width: 100% !important;
  height: 100% !important;
  top: 0 !important;
  left: 0 !important;
  object-fit: contain;
}

ytd-watch-flexy[fullscreen] #player-theater-container.ytd-watch-flexy {
  max-height: 100vh;
}

#voice-search-button,
ytd-topbar-menu-button-renderer[has-no-text],
ytd-notification-topbar-button-renderer[has-no-text],
ytd-download-button-renderer,
ytd-button-renderer:nth-last-child(2) {
  display: none !important;
}

#center.ytd-masthead {
  flex-basis: 500px;
}

body::-webkit-scrollbar {
  width: 0;
}
}