General ⇒ background color?

[suluclac]

I would like to have some background color applied to the following. I've tried \colorbox with no success. Been googling and looking for solution in docs, but no luck yet.
Thanks!

\begin{center}
\textbf{Sign Conventions for Mirrors}
\end{center}
\begin{itemize}
\item Both \textbf{R} and \textbf{f} are + if the center of curvature for the \textbf{R} is in front of the mirror.
\item Both \textbf{R} and \textbf{f} are - if the center of curvature for the \textbf{R} is in back of the mirror.
\end{itemize}

[marco_d]

Hello,

in the environent colorbox you can not use linebreaks. So you must use a parbox or a minipage. Here an example where I produce my own colorbox:

Code: Select all

\documentclass[11pt,a4paper,english]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{xcolor}
\usepackage{calc}
\usepackage{blindtext}
\newsavebox{\MYRAM}
\newenvironment{mycolorbox}{\par\noindent\begin{lrbox}{\MYRAM}\begin{minipage}{\textwidth-2\fboxsep}}
{\end{minipage}\end{lrbox}\colorbox{yellow}{\color{black}\usebox{\MYRAM}}\par}
\begin{document}
\blindtext
\begin{mycolorbox}
	\begin{center}
	\textbf{Sign Conventions for Mirrors}
	\end{center}
	\begin{itemize}
	\item Both \textbf{R} and \textbf{f} are + if the center of curvature for the \textbf{R} is in front of the mirror.
	\item Both \textbf{R} and \textbf{f} are - if the center of curvature for the \textbf{R} is in back of the mirror.
	\end{itemize}
\end{mycolorbox}

\blindtext

\end{document}

regards
Marco

[suluclac]

Thanks Marco!
I'll give this a shot. Seems so complicated for something apparently simple ...