Math & Science ⇒ How to make Theorems with colored boxes?

[M.A]

Hello,

How to make theorems show inside a box filled with a certain color ?
I need it also to split over two pages if the theorem was at the end of a page.

Regards,

[gmedina]

Hi,

you could try the shaded environment from the framed package. A little example:

Code: Select all

\documentclass{article}
\usepackage{xcolor}
\usepackage{amsthm}
\usepackage{framed}

\colorlet{shadecolor}{orange!15}

\newtheorem{theorem}{Theorem}

\newenvironment{theo}
  {\begin{shaded}\begin{theorem}}
  {\end{theorem}\end{shaded}}

\begin{document}

\begin{theo}
Some important theorem.
\end{theo}

\end{document}

[shadgrind]

You could also try the shadethm package:

Code: Select all

\documentclass{article}
\usepackage{xcolor}
\usepackage{amsthm}
\usepackage{shadethm}

\newshadetheorem{thm}{Theorem}
\definecolor{shadethmcolor}{HTML}{EDF8FF}
\definecolor{shaderulecolor}{HTML}{45CFFF}
\setlength{\shadeboxrule}{.4pt}

\begin{document}

\begin{thm}
Some important theorem.
\end{thm}

\end{document}

[M.A]

Thanks very much!
It worked with me.
but how to make shading with two colors (the shading changes gradually from the first color to the second color vertically or horizontally)?

[shadgrind]

If you want a gradient background, then you need to use something different. One way is to use TikZ. Here's an example using both horizontal and vertical gradients:

Code: Select all

\documentclass{article}
\usepackage{xcolor}
\usepackage{amsthm}
\usepackage{tikz}

\newtheorem{thm}{Theorem}
\newcommand{\statetheoremhoriz}[2][\textwidth]{
 \par\noindent\tikzstyle{mybox} = [draw=blue,left color=cyan!50,
  right color=cyan!5,thick,rectangle,inner sep=6pt]
 \begin{tikzpicture}
  \node [mybox] (box){%
   \begin{minipage}{#1}{#2}\end{minipage}
  };
 \end{tikzpicture}
}
\newcommand{\statetheoremvert}[2][\textwidth]{
 \par\noindent\tikzstyle{mybox} = [draw=blue,top color=cyan!50,
  bottom color=cyan!5,thick,rectangle,inner sep=6pt]
 \begin{tikzpicture}
  \node [mybox] (box){%
   \begin{minipage}{#1}{#2}\end{minipage}
  };
 \end{tikzpicture}
}
\newcommand{\statetheoremsolid}[2][\textwidth]{
 \par\noindent\tikzstyle{mybox} = [draw=blue,fill=cyan!50,
  thick,rectangle,inner sep=6pt]
 \begin{tikzpicture}
  \node [mybox] (box){%
   \begin{minipage}{#1}{#2}\end{minipage}
  };
 \end{tikzpicture}
}

\begin{document}

\statetheoremhoriz{
\begin{thm}
Some important theorem. It is very important. So important that
it is in a shaded box with a horizontal gradient.
\end{thm}
}

\statetheoremvert{
\begin{thm}
Another important theorem. It is very important. So important
that it is in a shaded box with a vertical gradient.
\end{thm}
}

\statetheoremsolid{
\begin{thm}
Not such an important theorem. That is why it is in a box with
solid shading.
\end{thm}
}

\end{document}

[M.A]

Thank you very much!
Regards,