%% 
%%  An UIT Edition example
%% 
%%  Example 02-02-8 on page 10.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{xcolor}
\StopShownPreambleCommands
\begin{document}
{ \setlength\fboxsep{10pt}%
  \colorbox{yellow}{$f(x)=\prod_{i=1}^{n}\left(i-\frac{1}{2i} \right)$} } and
{ \setlength\fboxrule{1.5pt}%
  \colorbox{cyan}{$f(x)=\prod_{i=1}^{n}\left(i-\frac{1}{2i} \right)$} }
\end{document}