LaTeX: New year post card of the year 2021

nyc2021.tex

\documentclass{article}
\usepackage[papersize={100mm,148mm},margin=0cm,
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\usepackage{luatexja-fontspec}
\usepackage{amsmath,tikz,graphicx,xcolor,xparse}
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\newfontface{\fChicago}{QTChicagoland.otf}
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\begin{document}
%=================================================
\begin{xPar}\centering
  \fRobo\xSize{36}\color{myred}
  \raisebox{0pt}[18mm][0mm]{%
    Hapi Niu Yia}
\end{xPar}
%=================================================
\vspace{6mm}
%=================================================
\begin{xPar}\centering
%
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%
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\fill[black, use as bounding box] (-20,-20) rectangle (520,520);
%\node[transform shape] at (460,-10)
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%
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\node[above right=0pt, inner sep=2pt,
  text=black, font={\fChicago\xSize{22}}] at (0,400) 
  {2021};
%
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\xOneBlock{400}  {0}{mcdgreen}
%
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%=================================================
\vspace{1mm}
\begin{xPar}\centering
  \fAoyagi\jAoyagi\xSize[13]{12}%
  \ltjsetparameter{kanjiskip=-.14\zw,xkanjiskip=-.08\zw}
  皆様のご健康とご多幸を\\
  お祈り申し上げます
\end{xPar}
\vspace{2mm}
\begin{xPar}\centering\begin{minipage}{90mm}
  \begin{xPar}
    \fNishiki\jNishiki\xSize{16}\color{myred}
    New Year Puzzle%
    \hfill
    {\xSize{14}\color{myred}%
      2021}%
    {\xSize{9}\color{mygreen!75!black}%
      \,年（令和\,}%
    {\xSize{14}\color{myred}%
      3}%
    {\xSize{9}\color{mygreen!75!black}%
      \,年）}%
  \end{xPar}
  \begin{xPar}
    \fNishiki\jNishiki\xSize{9}\color{myblue!75!black}%
    ～年賀パズル～
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    以下の条件に従って割り算の虫食い算を解きなさい。
    \par\vspace{0.2\baselineskip}
    \begin{itemize}
    \setlength{\itemsep}{0pt}
    \item 横に並ぶ一連の数字を全体で一つの整数と考えたとき、
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    ※例えば、\textcolor{myred}{\fVLG □□}には
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      %\draw[crline] (-7,48)--(97,48);
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  \par\vspace{-1mm}
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\end{document}