Beamer：框架标题的框

Question

我准备了以下来源

\documentclass[10pt,fleqn,xcolor=svgnames]{beamer}

\setbeamercolor{background canvas}{bg=Green!10}
\setbeamercolor{frametitle}{fg=Brown,bg=Yellow!20}
\setbeamercolor{normal text}{bg=DarkBlue}

\mode<presentation>

\begin{document}
\begin{frame}
\frametitle{Bla Bla}

Bla bla

\end{frame}
\end{document}

结果如下：

我想稍微修改一下要加框的框架标题的黄色框。我尝试使用命令，\setbeamertemplate但没有成功。这可能相当简单，其他主题中也有一些提示，但我还没有找到方法，而且我可能对 beamer 太不熟悉了！对此我很抱歉。

Answer 1

\documentclass[10pt,fleqn,xcolor=svgnames]{beamer}

\setbeamercolor{background canvas}{bg=Green!10}
\setbeamercolor{frametitle}{fg=Brown,bg=Yellow!20}
\setbeamercolor{normal text}{bg=DarkBlue}


\usepackage{tcolorbox}

\makeatletter

\setbeamertemplate{frametitle}{%
  \ifbeamercolorempty[bg]{frametitle}{}{\nointerlineskip}%
  \@tempdima=\textwidth%
  \advance\@tempdima by\beamer@leftmargin%
  \advance\@tempdima by\beamer@rightmargin%
  \begin{tcolorbox}[colback=Yellow!20,coltext=Brown,enlarge left by=-\beamer@leftmargin,width=\paperwidth]
    \usebeamerfont{frametitle}%
    \vbox{}\vskip-1ex%
    \if@tempswa\else\csname beamer@fteleft\endcsname\fi%
    \strut\insertframetitle\strut\par%
    {%
      \ifx\insertframesubtitle\@empty%
      \else%
      {\usebeamerfont{framesubtitle}\usebeamercolor[fg]{framesubtitle}\insertframesubtitle\strut\par}%
      \fi
    }%
    \vskip-1ex%
    \if@tempswa\else\vskip-.3cm\fi% set inside beamercolorbox... evil here...
  \end{tcolorbox}%
}

\makeatother

\begin{document}
\begin{frame}
\frametitle{Bla Bla}

Bla bla

\end{frame}
\end{document}