Membuat Bingkai untuk Teorema

Ada kalanya kita ingin definisi, dalil (teorema), dll. disajikan berbingkai agar tampak lebih indah. 

Bagaimana caranya? 

Berikut ini salah satu contoh struktur yang dapat dibuat.

\documentclass{scrartcl}
\title{Bingkai}
\usepackage[utf8]{inputenc}
\usepackage[framemethod=tikz]{mdframed}
\usetikzlibrary{calc}
\usepackage{chngcntr}
\usepackage{bm}
\usepackage{bbold}
% counters
\newcounter{theorem}
\newcounter{lemma}

% names for the structures
\newcommand\theoname{Teorema}
\newcommand\lemmname{Definisi}

\makeatletter
% mdf key for the eventual notes in the structures
\def\mdf@@mynote{}
\define@key{mdf}{mynote}{\def\mdf@@mynote{#1}}

% style for theorems
\mdfdefinestyle{mytheo}{
settings={\refstepcounter{theorem}},
linewidth=1pt,
innertopmargin=1.5\baselineskip,
roundcorner=10pt,
backgroundcolor=blue!05,
linecolor=teal,
singleextra={
  \node[xshift=10pt,thick,draw=teal,fill=cyan!30,rounded corners,anchor=west] at (P-|O) %
  {\strut{\bfseries\theoname~\thetheorem}\ifdefempty{\mdf@@mynote}{}{~(\mdf@@mynote)}};
},
firstextra={
  \node[xshift=10pt,thick,draw=teal,fill=cyan!30,rounded corners,anchor=west] at (P-|O) %
  {\strut{\bfseries\theoname~\thetheorem}\ifdefempty{\mdf@@mynote}{}{~(\mdf@@mynote)}};
}
}

% style for lemmas
\mdfdefinestyle{mylemm}{
settings={\refstepcounter{lemma}},
linewidth=1pt,
innertopmargin=1.5\baselineskip,
roundcorner=10pt,
backgroundcolor=red!05,
linecolor=red!70!black,
singleextra={
  \path let \p1=(P), \p2=(O) in
  node[thick,draw=teal!60!pink,fill=teal!05!pink,rounded corners] at (P-|0.5*\x2+0.5*\x1,0) %
  {\strut{\bfseries\lemmname~\thelemma}\ifdefempty{\mdf@@mynote}{}{~(\mdf@@mynote)}};
},
firstextra={
  \path let \p1=(P), \p2=(O) in
  node[thick,draw=teal!60!pink,fill=teal!05!pink,rounded corners] at (P-|0.5*\x2+0.5*\x1,0) %
  {\strut{\bfseries\lemmname~\thelemma}\ifdefempty{\mdf@@mynote}{}{~(\mdf@@mynote)}};
}
}

% some auxiliary environments
\newmdenv[style=mytheo]{theor}
\newmdenv[style=mylemm]{lemm}

% the actual environments
\newenvironment{theorem}[1][]
  {\begin{theor}[mynote=#1]}
  {\end{theor}\bigskip}
\newenvironment{lemma}[1][]
  {\begin{lemm}[mynote=#1]}
  {\end{lemm}\bigskip}

\makeatother

\begin{document}
...
\end{document}

Pada bagian inti dokumen, misalnya, dituliskan ini:

Adjie Gumarang Pujakelana 2013

maka beginilah hasilnya: 

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