Torn paper effect on a Tcolorbox

I tried to set-up a tcolorbox with a teared paper effect on the bottom side. I looked at these questions and answers:

• Torn page effect
• Torn paper: matching up the torn edges

And, I finally ended with the following code:

\documentclass{article} \usepackage{lipsum} \usepackage{tikz} \usetikzlibrary{decorations.pathmorphing,shadows.blur,shadings} %\pgfmathsetseed{1} % To have predictable results \usepackage[most]{tcolorbox} % Define a background layer, in which the parchment shape is drawn \pgfdeclarelayer{background} \pgfsetlayers{background,main} % This is the base for the fractal decoration. It takes a random point % between the start and end, and raises it a random amount, thus % transforming a segment into two, connected at that raised point This % decoration can be applied again to each one of the resulting % segments and so on, in a similar way of a Koch snowflake. \pgfdeclaredecoration{irregular fractal line}{init} { \state{init}[width=\pgfdecoratedinputsegmentremainingdistance] { \pgfpathlineto{% \pgfpoint{random * \pgfdecoratedinputsegmentremainingdistance}{% (random * \pgfdecorationsegmentamplitude - 0.02) * \pgfdecoratedinputsegmentremainingdistance}} \pgfpathlineto{\pgfpoint{\pgfdecoratedinputsegmentremainingdistance}{0pt}} } } % Define paper style \tikzset{ paper/.style={% draw=black!10, blur shadow, path picture={% \node at (path picture bounding box.center) { \includegraphics[width=\linewidth]{note-background.png} }; } }, irregular border/.style={% decoration={irregular fractal line, amplitude=0.2}, decorate, }, ragged border/.style={% decoration={random steps, segment length=7mm, amplitude=2mm}, decorate, } } \newtcolorbox{tcbnote}{% % enhanced jigsaw, <-- Beware, This rendering engine let the % frame appear on some PDF viewers empty, % Better use this rendering engine to avoid the bug interior code={% \begin{pgfonlayer}{background} % Draw the shape behind \fill[paper] % recursively decorate the bottom border decorate[irregular border]{% decorate{decorate{decorate{decorate[ragged border]{ ($(interior.south east) - (0, random * 5mm)$) -- ($(interior.south west) - (0, random * 5mm)$) } } } } } -- (interior.north west) -- (interior.north east) -- cycle; \end{pgfonlayer} }, sharp corners, boxrule=0pt, left=5pt, right=5pt, top=5pt, bottom=1em, } %% TColorBox Note environment \newlength\savedparindent \setlength\savedparindent\parindent \newenvironment{note}[1]{% \begin{tcbnote}{} \setlength\parindent{\savedparindent} \begin{center} \sffamily\bfseries\LARGE #1 \end{center}\par }{% \end{tcbnote} } \begin{document} \pagestyle{empty} \begin{note}{Note Title} \lipsum[1-2] \end{note} \end{document} 

The background image used here is the following.

The final result is as follow.

This fit perfectly my initial expectations, but I am not really satisfied with the LaTeX code I came with for several reasons (see below). So, I am asking for a few hints and advises to improve it.

My main problems are:

• I did not manage to use the native title of the tcolorbox because I did find how to expand the background to continuously cover also the first part of the box;

• [Solved thanks to Teepeemm] The \parindent variable seems to be reset to zero in this environment and I do not see why this happen. I did find a workaround by saving \parindent and restoring it inside the environment. But this is just a bad hack.

• Any other improvement ideas are more than welcome !