% theorem environment
\usepackage{framed}
-\usepackage[framed,thref,amsmath,hyperref]{ntheorem}
+\usepackage[framed,thref,thmmarks,amsmath,hyperref]{ntheorem}
% hyperlinks
\usepackage[colorlinks=true,linkcolor=black,citecolor=black]{hyperref}
\newrgbcolor{lbb}{0.75 0.8 0.88}
\newrgbcolor{lachs}{1.0 .93 .81}
%
-\newrgbcolor{ctheorem}{0.9 0.9 0.95}
-\newrgbcolor{cdefinition}{0.95 0.9 0.9}
-\newrgbcolor{cremark}{0.95 0.95 0.9}
+\newrgbcolor{ctheorem}{0.85 0.85 0.95}
+\newrgbcolor{cdefinition}{0.95 0.85 0.85}
+\newrgbcolor{cremark}{0.97 0.97 0.97}
\newrgbcolor{cproof}{0.95 0.92 0.95}
% roman numbers
\theoremstyle{plain}
\theoremseparator{:}
\theorembodyfont{\normalfont}
+\theoremsymbol{}
% theorem
-\theoremsymbol{\ensuremath{\diamondsuit}}
\shadecolor{ctheorem}
\newshadedtheorem{theorem}{Theorem}[section]
% definition
-\theoremsymbol{\ensuremath{\clubsuit}}
\shadecolor{cdefinition}
\newshadedtheorem{definition}[theorem]{Definition}
% remark
-\theoremsymbol{\ensuremath{\diamondsuit}}
\shadecolor{cremark}
\newshadedtheorem{remark}[theorem]{Remark}
% proof
\theoremstyle{nonumberplain}
\theoremsymbol{\rule{1ex}{1ex}}
\shadecolor{cproof}
-\newshadedtheorem{proof}{Proof}
+\newtheorem{proof}{Proof}
% author & title
\author{Frank Zirkelbach}