yt-local/youtube/static/gray_theme.css

:root {
    --background:            #2D3743;
    --text:                  #FFFFFF;
    --secondary-hover:       #73828C;
    --secondary-focus:       rgba(115, 130, 140, 0.125);
    --secondary-inverse:     #FFFFFF;
    --primary-background:    #2D3743;
    --secondary-background:  #102027;
    --thumb-background:      #35404D;
    --link:                  #22AAFF;
    --link-visited:          #7755FF;
    --border-bg:             #FFFFFF;
    --border-bg-settings:    #FFFFFF;
    --border-bg-license:     #FFFFFF;
    --buttom:                #2D3743;
    --buttom-text:           #FFFFFF;
    --button-border:         #102027;
    --buttom-hover:          #102027;
    --search-text:           #FFFFFF;
    --time-background:       #212121;
    --time-text:             #FFFFFF;
}