YouTube Ambient Theater Mode by cunhacf

/* ==UserStyle==
@name         YouTube Ambient Theater Mode
@version      20221030.17.02
@namespace    userstyles.world/user/cunhacf
@description  Enables YouTube's new Ambient Mode in Theater Mode and Fullscreen.
@author       cunhacf
@license      No License
==/UserStyle== */

@-moz-document domain("youtube.com") {
ytd-watch-flexy[theater] {
    width: 100vw;
    position: relative;
    overflow-x: hidden;
}

ytd-watch-flexy[theater] #player-theater-container.ytd-watch-flexy,
ytd-watch-flexy[fullscreen] #player-theater-container.ytd-watch-flexy {
    background: transparent;
    z-index: 1;
}

.html5-video-player.ytp-fullscreen {
    background: transparent;
}

ytd-watch-flexy[theater] #player.ytd-watch-flexy, ytd-watch-flexy[fullscreen] #player.ytd-watch-flexy {
    width: 100vw;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 0;
}

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