beamerouterthemeavalon.sty

\mode<presentation>
\RequirePackage{ifthen}

\newtcolorbox{frametitlebox}[1][]{
  sharp corners=all,frame hidden,
  drop small lifted shadow=black,enhanced,
  % colback=avalon@primay color,
  interior style={top color=avalon@primary color, bottom color=avalon@primary color!75!gray},
  width=\the\paperwidth+1em,#1
}

% Frame title
\defbeamertemplate*{frametitle}{avalon}[1][]
{
  \ifx\avalon@blueprint\undefined {
    \ifx\avalonprogressbar\undefined {
      \vspace*{-1em}
    } \else {
      \vspace*{-12.1mm}
      \begin{beamercolorbox}[wd=\paperwidth,ht=1.2cm]{ft}
        \usebeamercolor{primary color}
        \begin{tikzpicture}
          \fill[bg] (0,0) rectangle (\the\paperwidth, .3mm);
          \fill[bg!50!white] (0,0) rectangle (\insertframenumber*\paperwidth/\inserttotalframenumber, .3mm);
        \end{tikzpicture}
      \end{beamercolorbox}

      \vspace*{-8.3mm}
    } \fi

    \begin{addmargin}[-2.5em]{0em}
      \ifx\insertframesubtitle\@empty {
        \begin{frametitlebox}
          \centering \bfseries
          \Large \color{white} \insertframetitle
        \end{frametitlebox}
      } \else {
        \begin{frametitlebox}
          \centering \bfseries
          \normalsize \color{gray!50!white} \insertframesubtitle \\
          \Large \color{white} \insertframetitle
        \end{frametitlebox}
      } \fi
    \end{addmargin}
  } \else {
  } \fi
}

% \defbeamertemplate*{headline}{avalon}{hello}

\defbeamertemplate*{footline}{avalon}{
  \ifthenelse{\isundefined{\avalon@blueprint}}{
    \ifthenelse{\insertframenumber = 0}{%
      % don't show it in the title slide%
    }{%
      \vspace*{-5mm}
      \hspace*{\fill} %\vspace*{-1cm} \hspace*{-5mm}
      \begin{tikzpicture}
        \node (fn) {%
          \usebeamercolor{page number in head/foot}\color{fg}%
          \usebeamerfont{page number in head/foot}%
          \insertframenumber/\inserttotalframenumber};
        \node[below=of fn] {};
      \end{tikzpicture}
    }
  }{
    \LARGE \color{white} \tt
    \vspace*{-10mm}
    \hspace*{1.1mm}
    \begin{tikzpicture}
      \node[draw=white,thick,minimum width=\textwidth-2cm,minimum height=10mm] (title) at (0,0) {\insertframetitle};
      \draw[white,thick] (title.north east) ++(1mm,-.1mm)
      -- ++(10mm,0)
      -- ++(0,-10mm)
      -- ++(-10mm,0)
      -- ++(0,10.1mm) ++(0,-10mm)
      -- ++(10mm,10mm);
      \node (fn) at ([xshift=3.5mm,yshift=-3.5mm]title.north east) {\footnotesize\insertframenumber};
      \node (tfn) at ([xshift=4.5mm,yshift=-3.5mm]fn) {\footnotesize\inserttotalframenumber};
      \node[below=of title] {};
    \end{tikzpicture}
  }
}
\mode<all>