海报：rounded=false 去中心化子框

Question

我正在使用雅各布斯景观会议海报，我想将alertblock的边缘从柔和改为锐利。因此，我编辑了beamerthemeconfposter.sty并将 rounded 设置为 false。注释行是原始代码。

% Alert block definition (with frame)
\setbeamertemplate{block alerted begin}
{
  \par\vskip\medskipamount
  %\begin{beamercolorbox}[sep=0ex,rounded=true,center,dp={2ex}]{block alerted title}
  \begin{beamercolorbox}[sep=0ex,rounded=false,center,dp={2ex}]{block alerted title}
    \vskip0.01cm
    \usebeamerfont{block title}\large\insertblocktitle
  \end{beamercolorbox}
  {\parskip0pt\par}
  \usebeamerfont{block body}
  \vskip-0.8cm
  %\begin{beamercolorbox}[sep=0.5cm, rounded=true,center]{block alerted title}
  \begin{beamercolorbox}[sep=0.5cm, rounded=false,center]{block alerted title}
  \setlength{\inboxwd}{\linewidth}
  \addtolength{\inboxwd}{-1cm}
  %\begin{beamercolorbox}[rounded=true,wd={\inboxwd},center]{block alerted body}
  \begin{beamercolorbox}[rounded=false,wd={\inboxwd},center]{block alerted body}
  \setlength{\iinboxwd}{\inboxwd}
  \setlength{\inboxrule}{\inboxwd}
  \addtolength{\iinboxwd}{-0.5cm}
  \addtolength{\inboxrule}{0.5cm}
  \begin{center}
  \begin{minipage}{\iinboxwd}
  \justifying
}

但结果看起来很奇怪：内容现在是右对齐，而不是像以前一样居中。

结果 http://jb-electronics.de/tmp/poster_1.png

改变 -1cm

\addtolength{\inboxwd}{-1cm}

似乎会影响内容的水平对齐，但我觉得我缺少了一些东西。