# documentclass{book} + mdframed + leftmargin [duplicate]

My problem is when I use documentclass{book} leftmargin and rightmargin has no reaction, but It works with documentclass{article}. How I can fix this? I have to use documentclass{book}.

enter code here\begin{mdframed}[backgroundcolor=lightgray, leftmargin=1cm,rightmargin=1cm,roundcorner=8pt]


## marked as duplicate by Ludovic C., Torbjørn T., Stefan Kottwitz♦Oct 16 '13 at 14:10

• Please post a full , minimal compilable example such that we do not have to guess about the rest of the document. – daleif Oct 16 '13 at 12:01
• Include \documentclass, \usepackage{} and \end{document} commands in your minimal working example (MWE) – masu Oct 16 '13 at 12:18

Book is twosided, so in that case what is left and right? especially when they have different values.

See the section 6.7 in the mdframed manual. This works

\documentclass[a4paper]{book}
\usepackage{mdframed,lipsum}
\begin{document}

\lipsum[1]

\begin{mdframed}[innermargin=3cm,outermargin=1cm]
\lipsum[2]
\end{mdframed}

\end{document}