Youtube flex width by umi

/* ==UserStyle==
@name           youtube.com - 2025/04/26 12:16:00
@namespace      github.com/openstyles/stylus
@version        1.0.3
@description    Increase the size of the youtube video to fit the screen resolution.
@author         umi
==/UserStyle== */

@-moz-document regexp(".*youtube\\.com/(watch\\?|live/).*") {
    ytd-watch-flexy[flexy] #player-container-outer.ytd-watch-flexy {
        max-width: none;
    }
    ytd-watch-flexy[flexy][use-larger-max-player-value]:not([full-bleed-player][full-bleed-no-max-width-columns]) #columns.ytd-watch-flexy {
        max-width: none;
        margin: 0;
    }

    ytd-watch-flexy[flexy][is-two-columns_][is-extra-wide-video_]:not([full-bleed-player][full-bleed-no-max-width-columns]):not([fixed-panels]) #primary.ytd-watch-flexy, ytd-watch-flexy[flexy][is-two-columns_][is-four-three-to-sixteen-nine-video_]:not([full-bleed-player][full-bleed-no-max-width-columns]):not([fixed-panels]) #primary.ytd-watch-flexy {
        max-width: none;
    }
    
    #player  {
        margin-bottom: calc(
            min(
                max(
                    calc((var(--ytd-watch-flexy-height-ratio) - var(--ytd-watch-flexy-width-ratio)) * 1000),
                    0
                ),
                1
            ) * var(--ytd-watch-flexy-height-ratio) / var(--ytd-watch-flexy-width-ratio) * -95vh
        );
    }
    
    #player-container {
               container-type: size;
                container-name: container;
    }
    
    .html5-video-container {
        width: 100%;
        height: 100%;
        container-type: size;
        container-name: video;
    }

    @container container (aspect-ratio < 1) {
        #ytd-player {
            max-height: 92vh;
        }
        #player-container {
            margin-bottom: -1000px;
        }
    }
    
    @container container (aspect-ratio > 1) {
        .html5-video-player .video-click-tracking, .html5-video-player .video-stream {
            width: 100% !important;
            height: auto !important;
        }
    }
}