# Vertical Spacing After NewEnvironment Definition

How can I modify this,

\newenvironment{definition}[1][Definition]{\begin{mdframed}\begin{trivlist}
\item[\hskip \labelsep {\bfseries #1}]}{\end{trivlist}\end{mdframed}}


so that a newline (vertical space) is inserted after the word "Definition"? I want the content of my definition(s) to start below it.

• Why are you working with a trivlist here? What is your goal in the first place? There might be a much simpler solution. – Johannes_B May 11 '16 at 6:03
• By the way, there are theorem related packages that allow you to define Definition environments pretty easily. – Johannes_B May 11 '16 at 6:33
• @Johannes_B Its just the look of what it produces. I am really open to change it. What I have above is just from an online source. – 9301293 May 11 '16 at 6:56
• I am interested, do you have a link available? – Johannes_B May 11 '16 at 6:57
• @Johannes_B No, sorry. I didn't save it. I am interested in something that is boxed off and had "Definition" in bold, and a newline. – 9301293 May 11 '16 at 7:02

Definitions are usually made with a theorem package like amsthm. On the other hand, if you are not sure if you want some more fancy stuff later on, i would start with something based on tcolorbox. The example shows the default box, it can be customized in various ways, to look more simple or to look even much more fancy.

\documentclass{article}
\usepackage{blindtext}
\usepackage{mdframed}
\usepackage{tcolorbox}
\newtcolorbox{definition}{title=Definition,}
%\usepackage{showframe}
\usepackage{amsthm}
\newtheoremstyle{phatty}{2ex}{2ex}{}{}{\bfseries}{}{\newline}{}
\theoremstyle{phatty}
\newtheorem*{pht}{Phatty}
\surroundwithmdframed{pht}
\begin{document}
\begin{definition}
\blindtext
\end{definition}
\begin{pht}
\blindtext
\end{pht}
\end{document}

• Thank you very much! I will make some sweet looking definitions, now. – 9301293 May 11 '16 at 7:35