beamerouterthemeosu.sty

\mode<presentation>

\definecolor{orangeosu}{rgb}{0.9,0.3,0}

% Frame title
\defbeamertemplate*{frametitle}{osu}[1][]
{
  \begin{beamercolorbox}[wd=\paperwidth,ht=1.15cm]{frametitle} 
  \begin{tikzpicture}
  \useasboundingbox[fill=white](0,0) rectangle(\the\paperwidth,1.2);
  \fill[black] (0,0) rectangle(3,1.2);
  \fill[orangeosu] (3.00,0) rectangle(\the\paperwidth,1.2);
   \ifx\insertframesubtitle\@empty%
      {\node[anchor=west, white,font=\large] at (3.2,0.61){\insertframetitle};}
      \else%
      {\node[anchor= west, white,font=\large] at (3.2,0.81){\insertframetitle};%
       \node[anchor= west, white,font=\small] at (3.2,0.41){\insertframesubtitle};}%
      \fi
  \end{tikzpicture}
  \end{beamercolorbox}
}

\mode<all>