# How to enclosure a text block into big square brackets?

everybody. I need to enclosure a text block into big square brackets. Something like this (I need to replicate it, more or less):

I've read that it could be possible with tikz but I don't know anything about that package. Even, I found a code that reproduce something similar but with braces in this post: Adding a large brace next to a body of text The code is this:

\documentclass{article}
\usepackage{lipsum}
\usepackage[many]{tcolorbox}
\usetikzlibrary{decorations.pathreplacing}

\newtcolorbox{rightbrace}{%
enhanced jigsaw,
breakable, % allow page breaks
frame hidden, % hide the default frame
overlay={%
\draw [
fill=none, % fill paper
decoration={brace,amplitude=0.5em},
decorate,
ultra thick,
gray,
]
% right line
(frame.north east)--(frame.south east);
},
% paragraph skips obeyed within tcolorbox
parbox=false,
}

\begin{document}

\begin{itemize}
\item First line
\begin{rightbrace}
\item Second line
\item Third line, which is quite long and seemingly tedious in the extreme
\item Fourth line, which isn't as long as the third
\end{rightbrace}
\item Fifth line
\end{itemize}

\begin{rightbrace}
\lipsum[1]
\end{rightbrace}
\lipsum[2]

\end{document}

How could I put the square brackets around a block of text? (Using tikz, tcolobox or whatever package then can be useful for it).

This is the output:

And the code is:

\documentclass{article}

\usepackage{lipsum}
\usepackage[many]{tcolorbox}

\newtcolorbox{squarebrackets}[2][]{%
empty,
breakable,
boxsep=0pt,boxrule=0pt,left=5mm,right=5mm,
toptitle=3mm,bottomtitle=1mm,
title=\colorbox{yellow}{#2},
coltitle=black,
fonttitle=\bfseries,
underlay={%
\draw[gray!50,line width=1mm]
([xshift=5mm,yshift=-0.5mm]frame.north west)--
([xshift=0.5mm,yshift=-0.5mm]frame.north west)--
([xshift=0.5mm,yshift=0.5mm]frame.south west)--
([xshift=5mm,yshift=0.5mm]frame.south west)
([xshift=-5mm,yshift=-0.5mm]frame.north east)--
([xshift=-0.5mm,yshift=-0.5mm]frame.north east)--
([xshift=-0.5mm,yshift=0.5mm]frame.south east)--
([xshift=-5mm,yshift=0.5mm]frame.south east)
;
},
% paragraph skips obeyed within tcolorbox
parbox=false,#1
}

\begin{document}

\lipsum[1]

\begin{squarebrackets}{Corolario}
\lipsum[2]
\end{squarebrackets}

\lipsum[3]

\end{document}
• Thanks, Thomas. Your code worked!! Now, I have a new problem: in several "Corolarios" I have to insert an image between two paragraph and, when I make the corolario in the squarebrackets environment, the figure environment doesn't work. So, I had to put the images ( \includegraphics) in a minipage environment. So, I lost the possibility to use \caption for automatically numbering. How could I to modify this code in order to the possiblity to use the figure environment? – Fabio Aug 4 '17 at 4:12
• @Fabio For non-floating environments, you can use \captionof from the caption package, see e.g. tex.stackexchange.com/questions/45073/… – Thomas F. Sturm Aug 4 '17 at 7:29