自定义框架环境，垂直线条

Question

我正在使用下面的代码（从这个网站上获取的）：https://jevon.org/wiki/Fancy_Quotation_Boxes_in_Latex）来生成这个

我想让左侧竖线在框的右侧重复出现，但我不知道如何修改代码。任何帮助都将不胜感激。提前致谢。

平均能量损失

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{color, colortbl}
\usepackage{changepage}
\usepackage[english]{babel}
\usepackage{lipsum}
% for formal definitions
\usepackage{framed}
% environment derived from framed.sty: see leftbar environment definition
\definecolor{formalshade}{rgb}{0.95,0.95,1}
\definecolor{darkblue}{rgb}{0.0, 0.0, 0.55}

\newenvironment{formal}{%
  \def\FrameCommand{%
    \hspace{1pt}%
    {\color{darkblue}\vrule width 2pt}%
    {\color{formalshade}\vrule width 4pt}%
    \colorbox{formalshade}%
  }%
  \MakeFramed{\advance\hsize-\width\FrameRestore}%
  \noindent\hspace{-4.55pt}% disable indenting first paragraph
  \begin{adjustwidth}{}{7pt}%
  \vspace{2pt}\vspace{2pt}%
}
{%
  \vspace{2pt}\end{adjustwidth}\endMakeFramed%
}

\begin{document}

\begin{formal}
    \textit{``\lipsum[1]''}
\end{formal}

\end{document}

Answer 1

我将使用tcolorboxinsted offramed并定义框，如下例所示：

\documentclass{article}
\usepackage[most]{tcolorbox}
\usepackage{lipsum}

\definecolor{formalshade}{rgb}{0.95,0.95,1}
\definecolor{darkblue}{rgb}{0.0, 0.0, 0.55}

\newtcolorbox{mybox}{
    enhanced,
    boxrule=0pt,
    frame hidden,
    borderline west={2pt}{0pt}{darkblue},
    borderline east={2pt}{0pt}{darkblue},
    colback=formalshade,
    sharp corners, 
    fontupper=\itshape
    }
\begin{document}

\begin{mybox}
``\lipsum[1]''
\end{mybox}

\end{document}