yt.css

[is-watch-page] ytd-page-manager {
  margin-top: 0!important;
}

[is-watch-page] #player-theater-container:empty~#columns #primary,
[is-watch-page] #player-theater-container:empty~#columns #secondary{
    padding-top: 56px;
}

[is-watch-page] ytd-masthead,
[is-watch-page] #masthead-container.ytd-app::after {
  transform: translateY(-56px);
  transition: transform .1s .5s ease-out;
}
[is-watch-page] #masthead-container:hover ytd-masthead,
[is-watch-page] #masthead-container:hover.ytd-app::after {
  transform: translateY(0px);
}

[is-watch-page] [theater] #player.ytd-watch {
  height: 100vh!important;
  max-height: 100vh!important;
}

ytd-watch-flexy[theater] #player-theater-container.ytd-watch-flexy, 
ytd-watch-flexy[fullscreen] #player-theater-container.ytd-watch-flexy,
[is-watch-page] [theater] #player video {
  width: 100%!important;
  height: 100vh!important;
  max-height: 100vh!important;
  max-width: 100%!important;
  left: 0!important;
}

[is-watch-page] .ytp-chrome-top.ytp-share-button-visible,
[is-watch-page] #iv-drawer .iv-drawer-header,
[is-watch-page] #iv-drawer .iv-drawer-content {
  margin-top: 30px;
}

[is-watch-page] [theater] .ytp-chrome-top.ytp-share-button-visible,
[is-watch-page] [theater] #iv-drawer .iv-drawer-header,
[is-watch-page] [theater] #iv-drawer .iv-drawer-content,
[is-watch-page] [theater] .ytp-multicam-menu-header,
[is-watch-page] [theater] .ytp-multicam-menu-items,
[is-watch-page] [theater] .ytp-playlist-menu-header,
[is-watch-page] [theater] .ytp-playlist-menu-items,
[is-watch-page] [theater] .ytp-share-panel-close {
  margin-top: 56px;
}

[is-watch-page] .ytp-tooltip.ytp-tooltip-opaque.ytp-bottom {
  right: 60px!important;
  top: 35px!important;
}

[is-watch-page] [theater] .ytp-tooltip.ytp-tooltip-opaque.ytp-bottom {
  right: 60px!important;
  top: 60px!important;
}

@supports (scrollbar-width: none) {
  html {
    scrollbar-width: none;
  }
}
@supports not (scrollbar-width: none) {
  html::-webkit-scrollbar {
    display: none;
  }
}