Btukfyl

I'm using listings to format blocks of code in my xeLaTeX.When I insert this picture into Anki's card, the inserted code has extra blank lines. Following is my MWE:

documentclass{standalone} 

usepackage{tcolorbox,listings}

usepackage{fontspec}

setmonofont{Consolas}

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,

frame=single,

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{code}{

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{code}

begin{tikzpicture}

filldraw [gray] (0,0) circle (2pt)

(1,1) circle (2pt)

(2,1) circle (2pt)

(2,0) circle (2pt);

draw (0,0) .. controls (1,1) and (2,1) .. (2,0);

end{tikzpicture}

end{code}

[/latex]

When executed, that is, run via pdflatex or via latex followed by dvips, the resulting will contain something that looks like this:



We are working on

begin{tikzpicture}

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

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

end{tikzpicture}.



begin{document}

How to eliminate the extra blank lines at the top?