自定义单个部分

Question

我如何自定义单个部分的标题，使其与其他部分的标题不同，例如，框定部分标题练习。就像这张图片一样：

Answer 1

我已经意识到类似顶部的图片的东西并定制一个单个部分，但我有三个问题。第一个是自定义部分的标题太小。第二个在主题表中自定义部分的标题被切成两半。第三所有遵循自定义部分的非自定义部分都与自定义部分相同。看看下面的图片。

   \documentclass{report}
\usepackage{trace}

\usepackage{xcolor}
\usepackage[explicit]{titlesec}

\definecolor{sec}{RGB}{0,163,243}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%% OK! %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\makeatletter
\newcommand\mysec[2][\DefaultOpt]{%
    \titleformat{\section}[hang]{\sffamily\Huge\bfseries}{}{0.5ex}%
    {\begin{minipage}{1\textwidth}%
            \noindent
            \color{sec}%
            \llap{\vrule width\textwidth height2ex depth0ex\hskip0.75ex}%
            \textcolor{sec}{\unskip#1}%
            \hskip0.75ex%
            \rlap{\vrule width\textwidth height2ex depth0ex}%
    \end{minipage}}[\smallskip]%
    \def\DefaultOpt{#2}%
    \section[#1]{#2}%
}
\makeatother
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}
    \tableofcontents
\chapter{The first chapter}
\section{Normal section}
Some text
\mysec{The first \\ section}
Some text
\section{The second section}
Some text
\section{The third section}
\end{document}