How to set width of mdframed?

Question

I am new to latex i want to set a width and height of the mdframed. can any one help me to achieve this task.

\documentclass{article}
\usepackage{xcolor}
\usepackage{mdframed}
\newtheorem{mdtheorem}{Theorem}
 \newenvironment{theorem}%
 {\begin{mdframed}[backgroundcolor=lightgray]\begin{mdtheorem}}%
 {\end{mdtheorem}\end{mdframed}}
\begin{document}
\begin{theorem}
Sample
\end{theorem}
\end{document}

My current output is ,
My expected output is

enter image description here

"My expected output" means that the width of the frame should adapt automatically to the contents of the frame, or do you want a fixed predefined width? — Gonzalo Medina, Mar 06 '14 at 15:15
yes, The frame should be adapt automatically to the contents of the frame. — PSK, Mar 06 '14 at 15:17
sounds quite a lot like mdframed: size frame to content and the links within.... — cmhughes, Mar 06 '14 at 15:21

score 5 · Accepted Answer · edited Jun 10 '20 at 12:32

Here is one solution that uses varwidth and environ packages. First the \BODY of the environment is saved in a \usebox using the varwidth environment and then its width is measured to specify the \userdefinewidth of the mdframed environment:

enter image description here

Notes:

The showframe package was used just to show the page margins. It is not needed in your actual use case.
This is a slightly modified version of the solution at mdframed: size frame to content.

Code:

\documentclass{article}
\usepackage{xcolor}
\usepackage{mdframed}
\usepackage{environ}
\usepackage{varwidth}
\usepackage{showframe}
\newlength{\TheoremWidthTweak}%
\NewEnviron{theorem}[1][]{%
    \setlength{\TheoremWidthTweak}{\dimexpr%
        +\mdflength{innerleftmargin}
        +\mdflength{innerrightmargin}
        +\mdflength{leftmargin}
        +\mdflength{rightmargin}
        }%
    \savebox0{%
        \begin{varwidth}{\dimexpr\linewidth-\TheoremWidthTweak\relax}%
            \BODY
        \end{varwidth}%
    }%
    \begin{mdframed}[backgroundcolor=lightgray,userdefinedwidth=\dimexpr\wd0+\TheoremWidthTweak\relax, #1]
        \usebox0
    \end{mdframed}
}
\begin{document}
\begin{theorem}[backgroundcolor=yellow!20]
    Sample
\end{theorem}
\begin{theorem}[backgroundcolor=green!20]
    Somewhat longer text.
\end{theorem}
\begin{theorem}[backgroundcolor=orange!20]
    Much longer text that takes up more than one line. 
    This should span across the entire width of the page and continue on to the next line.
\end{theorem}
\end{document}

How to set width of mdframed?

1 Answers1

Notes:

Code: