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\documentclass[12pt‎ , ‎a4paper]{report}‎

‎\chapter{Chapter one}‎

‎‎\section{Section 1}‎‎‎‎
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Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. – Christian Hupfer Apr 27 '14 at 6:31
Please have a look on various possibilities, such as amsthm or tcolorbox etc. – Christian Hupfer Apr 27 '14 at 6:34

An example with a theorem like environment:



\chapter{Chapter one}
\section{Section 1}

\begin{exercise}[optional argument]
foo bar baz



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thanks very much. I whant no marginpar like style's marginpar chapter and box just around "Exersize" – iman Apr 27 '14 at 7:10
that is easy: \fcolorbox{blue}{white}{Exercise} – Herbert Apr 27 '14 at 7:13
I whant no Margin – iman Apr 27 '14 at 7:25
@iman: Which margin do you mean? Between the box frame and "Exercise"? Reduce \fboxseprule then when using \fcolorbox. – Christian Hupfer Apr 27 '14 at 7:31
Tanks. I whant no border the page and no fancy for section Exercise. – iman Apr 27 '14 at 7:32

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