Cfrgtkky

I'm using listings to format blocks of code in my xeLaTeX.I found that when I insert a piece of code, the output image will generate a number in the bottom footer. When I insert this picture into Anki's card, it will open a long, large blank.
Following is my MWE:

documentclass{article}

usepackage{tcolorbox,listings}

usepackage{listings}

usepackage{color}

usepackage{tikz}

usepackage{framed}



definecolor{background}{HTML}{EEEEEE}

definecolor{comments}{HTML}{868686}

definecolor{darkred}{RGB}{139,0,0}

definecolor{darkblue}{RGB}{0,0,139}

definecolor{chartreuse}{RGB}{127,255,0}

definecolor{drakgreen}{RGB}{0,128,0}

definecolor{lightgray}{RGB}{238,239,240}





lstset{

    language=[LaTeX]Tex,

    keywordstyle=color{darkblue},

    texcsstyle=*color{blue},

    basicstyle=normalfontttfamily,

    commentstyle=color{comments}ttfamily,

    stringstyle=rmfamily,

    numbers=none,

    numberstyle=scriptsize,



    numbersep=8pt,

    showstringspaces=false,

    breaklines=true,

    frameround=ftff,

    captionpos=t,

    belowcaptionskip=0em,

    belowskip=0em,



    literate=

            *{{}{{textcolor{darkred}{{}}}{1}

            {}}{{textcolor{darkred}{}}}}{1}

            {[}{{textcolor{darkred}{[}}}{1}

            {]}{{textcolor{darkred}{]}}}{1},

}

lstdefinestyle{mystyle}{

     language=[LaTeX]Tex,

     extendedchars=true, 

     breaklines=true,

     breakatwhitespace=true,

     basicstyle=ttfamily,

     numbers=none,



     keywordstyle=color{darkblue},

     keywordstyle=[2]color{blue},

     keywordstyle=[3]color{darkblue},

     keywordstyle=[4]color{drakgreen},

     alsoletter = {!},

     keywords=[2]{definecolor,node,addplot},

     keywords=[3]{usepackage},

     keywords=[4]{begin,end,document,figure,figure*,axis}

 }



tcbuselibrary{listings,skins,breakable}

newtcblisting{mycode}{

      arc=0mm,

      top=0mm,

      bottom=0mm,

      left=3mm,

      right=0mm,

      width=textwidth,

      boxrule=1pt,

      colback=lightgray,

      listing only,

      listing options={style=mystyle},

      breakable

}



begin{document}

begin{mycode}

documentclass{article} % say

usepackage{tikz}

begin{document}

We are working on

begin{tikzpicture}

  draw (-1.5,0) -- (1.5,0);

  draw (0,-1.5) -- (0,1.5);

end{tikzpicture}.

end{document}

end{mycode}

We are working on

end{document}

It generates such an image：

How do I close the frame number near the footer so that the resulting image size is appropriate?