LaTeX Forum

\documentclass[a4paper, 12pt]{amsart} 
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc} 
\usepackage{lmodern} 
\usepackage[ngerman]{babel} 
\usepackage{graphicx} 

\usepackage{xcolor}
\colorlet{footnotecolor}{green}
\renewcommand*{\thepage}{\textcolor{footnotecolor}{\arabic{page}}} 
\renewcommand*{\thefootnote}{\textcolor{footnotecolor}{\arabic{footnote}}} 
\newcommand*\myfootnote[1]{\footnote{\color{footnotecolor}#1}}

\usepackage{datatool}
\DTLnewdb{pbfootnote}

\newcommand*\pbfootnote[1]{%
  \footnotemark%
  \DTLnewrow{pbfootnote}\DTLnewdbentry{pbfootnote}{footnote}{#1}%
  }

\newcommand\colorparbox[3]{%
  \DTLcleardb{pbfootnote}%
  \noindent%
  \colorbox{#1}{%
    \parbox{\dimexpr\linewidth-2\fboxsep\relax}{\color{#2}#3}%
  }%
  \addtocounter{footnote}{-\DTLrowcount{pbfootnote}}%
  \DTLforeach*{pbfootnote}{\dtlpbfootnote=footnote}{%
    \stepcounter{footnote}\footnotetext{\color{footnotecolor}\dtlpbfootnote}%
  }%
}

\begin{document} 
Text\myfootnote{normale Fußnote}

\colorparbox{black}{white}{%
  \section{Einleitung} 
  Text. Blablabla\pbfootnote{Fußnote 1} Hier steht auch noch etwas\pbfootnote{Fußnote 2}.
} 

\colorparbox{black}{white}{%
  \section{Weiteres} 
  Text. Blablabla\pbfootnote{Fußnote 3} Hier steht auch noch etwas\pbfootnote{Fußnote 4}.
} 
\end{document}