%% 
%%  A DANTE-Edition example
%% 
%%  Example 22-04-1 on page 331.
%% 
%%  Copyright (C) 2011 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[]{article}
\pagestyle{empty}
\setlength\textwidth{225.70511pt}
\setlength\parindent{0pt}

\usepackage{pst-blur,amsmath}

\begin{document}
\psblurbox{\parbox{0.9\linewidth}{%
    \[F(x)=\int f(x)dx\]}}

\medskip
\psblurbox[blurbg=red]{%
  \parbox{0.9\linewidth}{%
    \[F(x)=\int f(x)dx\]}}

\bigskip
\psblurbox[blurbg=blue!30!red!80,
  blurradius=5pt]{%
    \parbox{0.9\linewidth}{%
      \begin{align}
        x_1 &= x_0-\frac{F(x_0)}%
          {F^\prime(x_0)}\ge x_0
      \end{align}}}
\end{document}