答案1
通过重新定义章节标题的标准定义可以实现类似的效果。
\documentclass{book}
\usepackage{xcolor,blindtext}
\usepackage{lmodern}
\makeatletter
\renewcommand\@makechapterhead[1]{%
\vspace*{20pt}%
{\setlength{\parindent}{0pt} \raggedleft \normalfont
\ifnum \value{secnumdepth} >-1
\if@mainmatter
{\fontsize{56pt}{0pt}\color{red!50!black}\bfseries\thechapter
\par}\nobreak
\fi
\fi
\interlinepenalty\@M
\Huge \bfseries #1\par\nobreak
\vskip 40pt
}}
\makeatother
\begin{document}
\chapter{Wombat and Alpaca}
\blindtext
\end{document}