 \documentclass[a4,12pt]{seminar}
 
 % Definition of packages to use...........................................
 % (all in standard LaTeX distribution)
 
 \usepackage{calc}               % Simple computations with LaTeX variables
 \usepackage[hang]{caption2}     % Improved captions
 \usepackage{fancybox}           % To have several backgrounds
                                 % (must be loaded before `fancyvrb')
 \usepackage{fancyhdr}           % Headers and footers definitions
 \usepackage{fancyvrb}           % Fancy verbatim environments
 \usepackage{pstcol}             % PSTricks with the standard color package
                                 % (before `graphicx' for the \scalebox macro)
 \usepackage{graphicx}           % Standard graphics package
 \usepackage{multido}            % General loop macro
 \usepackage{pifont}             % Ding symbols (mainly for lists)
 \usepackage{pst-3d}             % PSTricks 3D framed boxes
 \usepackage{pst-grad}           % PSTricks gradient mode
 \usepackage{pst-node}           % PSTricks nodes
 \usepackage{pst-slpe}           % Improved PSTricks gradients
 \usepackage{semcolor}           % Seminar colored slides
 \usepackage{semhelv}            % Seminar helvetica fonts
 \usepackage{semlayer}           % Seminar overlays
 \usepackage{slidesec}           % Seminar sections and list of slides
 \usepackage{thumbpdf}           % Thumbnails for PDF versions
 \usepackage{url}                % Convenient URL typesetting
 
 %\input{seminar.bug}             % Official bugs corrections
 %\input{seminar.bg2}             % Unofficial bugs corrections
                                 % (warning: you must load `longtable' before
                                 % if you use it)
 %\input{seminar.bg3}             % Unofficial bugs corrections
 
                                 % Hyperlinks for PDF versions
 \usepackage[ps2pdf,a4paper,
             colorlinks=true,pdfpagemode=UseNone,urlcolor=NavyBlue]{hyperref}
 
 % Workaround to use hyperref and landscape slides
 % Remove if you are using portrait slides
 \makeatletter
   \def\special@paper{297mm,210mm}
 \makeatother


  % Identification of the file................................................
  \def\FileAuthor{E.A. Gonzalez-Solares}
  \def\FileTitle{Seminar Tutorial}
  \def\FileSubject{University of Sussex}
  
  \hypersetup{%
    pdftitle      = \FileTitle{},
    pdfsubject    = \FileSubject{},
    pdfkeywords   = {LaTeX, PDF},
    pdfauthor     = \FileAuthor{},
    pdfcreator    = {\LaTeX\ with package \flqq hyperref\frqq},
  }

  % Customization of seminar package...........................................
  
  \slidesmag{2}     % Set magnification of slide
  \slideframe{none} % No default frame
  
  % General size parameters
  \renewcommand{\slideparindent}{5mm}
  \raggedslides[0mm]
  \setlength{\slidewidth}{9.0in}
  \setlength{\slideheight}{6.8in}
  \def\SeminarPaperWidth{210truemm}
  \def\SeminarPaperHeight{297truemm}
  
  \renewcommand{\slidetopmargin}{15.5mm}
  \renewcommand{\slidebottommargin}{13mm}
  \renewcommand{\slideleftmargin}{4mm}
  \renewcommand{\sliderightmargin}{4mm}
  
  % To adjust the frame length to the header and footer ones
  %\autoslidemarginstrue
  
  % We suppress the header and footer `fancyhdr' rules
  \fancyhf{} % Clear all fields
  \renewcommand{\headrule}{}
  \renewcommand{\footrule}{}
  
  % Headers and footers personalization using the `fancyhdr' package
  \fancyhead[L]{\small \FileTitle{}}
  \fancyhead[R]{\small \FileAuthor{}}
  \fancyfoot[L]{\small \FileSubject{}}
  \fancyfoot[C]{}
  \fancyfoot[R]{\small Page \theslide}
  
  % To avoid that the headers be too close of the top of the page
  \renewcommand{\slidetopmargin}{1.5cm}
  
  % To center horizontally the headers and footers (see seminar.bug)
  \renewcommand{\headwidth}{\textwidth}

  % Paragraph title
  %\newcommand{\ParagraphTitle}[2][LemonChiffon]{%
  %\noindent\psshadowbox[fillstyle=solid,fillcolor=#1]{\large{#2}}}
  
  % Centered paragraph title
  %\newcommand{\CenteredParagraphTitle}[2][LemonChiffon]{%
  %\centerline{\psshadowbox[fillstyle=solid,fillcolor=#1]{\large{#2}}}}
  
  % Customization of the headings and subheadings
  \renewcommand{\makeslideheading}[1]{%
  \CenteredParagraphTitle[LightCyan]{%
  \textcolor{black}{\textbf{#1}}}}
  \renewcommand{\makeslidesubheading}[1]{%
  \CenteredParagraphTitle{\theslidesubsection{} -- #1}}
  
  % "dinglist" environment
  % Redefinition of it to be able to use colored symbols
  \renewenvironment{dinglist}[2][black]
  {\begin{list}{\ding{#2}}{}}{\end{list}}
  % Symbol definitions for these lists
  \newcommand{\DingListSymbolA}{43}
  \newcommand{\DingListSymbolB}{243}
  \newcommand{\DingListSymbolC}{224}
  \newcommand{\DingListSymbolD}{219}
  
  % Boxed equation
  \newcommand{\eqbox}[2][0.6]{%
  \centerline{\psshadowbox[fillstyle=solid,fillcolor=LightYellow]{%
  \parbox{#1\hsize}{%
      \[
        \textcolor{black} {#2}
      \]}}}}
  
  % Background
  \newcommand{\SeminarBackgroundCompositeColorFirst}{LightCyan}
  \newcommand{\SeminarBackgroundCompositeColorSecond}{NavyBlue}
  
%  \SeminarNewSlideFrameBackground{SeminarBackgroundComposite}{{%
%  \psframe(\SeminarPaperHeight,\SeminarPaperWidth)%
%  \rput(24truemm,190truemm){%
%    \psframe[linestyle=none,fillstyle=gradient,gradmidpoint=1,gradangle=90,
%             gradbegin=\SeminarBackgroundCompositeColorSecond,
%             gradend=\SeminarBackgroundCompositeColorFirst](-0.1,0)(5,0.2)
%    \psframe[linestyle=none,fillstyle=gradient,gradmidpoint=1,
%             gradbegin=\SeminarBackgroundCompositeColorSecond,
%             gradend=\SeminarBackgroundCompositeColorFirst](-0.1,0.03)(0.1,-5)}}
%  \rput(273truemm,14truemm){%
%    \psframe[linestyle=none,fillstyle=gradient,gradmidpoint=1,gradangle=90,
%             gradbegin=\SeminarBackgroundCompositeColorFirst,
%             gradend=\SeminarBackgroundCompositeColorSecond](-5,0.2)(0.1,0)
%    \psframe[linestyle=none,fillstyle=gradient,gradmidpoint=1,
%             gradbegin=\SeminarBackgroundCompositeColorFirst,
%             gradend=\SeminarBackgroundCompositeColorSecond](-0.1,5)(0.1,0)}}
%  
  
  \renewcommand{\SeminarBackgroundCompositeColorFirst}{LightBlue}
  \renewcommand{\SeminarBackgroundCompositeColorSecond}{NavyBlue}
  %\SeminarSlideFrameBackground{SeminarBackgroundComposite}
  
  
 \begin{document}
 
 \pagestyle{fancy}
 
 \begin{slide}
 
 \begin{center}
   \ParagraphTitle{\bf \Large Seminar Tutorial }
 \vspace{5mm} \\
 \textit{Eduardo A. Gonzalez-Solares} \\
 \end{center}
 
 \end{slide}
 
 \begin{slide}
 \slideheading{ Second Slide } \label{slide:two}
 \begin{dinglist}{\DingListSymbolC}
 \item First item
 \item Second item with a link to
   \href{http://astronomy.sussex.ac.uk/~eddie/}{MY HOMEPAGE}.
 \end{dinglist}
 
 \eqbox[0.5]{%
   \left( \frac{d N}{d z} \right) = \frac{3 \mathcal{N} \Omega_s}{2
   z_c^3} z^2 \exp \left[ - \left( \frac{z}{z_c} \right)^{3 / 2} \right]
 }
 
 \end{slide}
 
 \end{document}
 

