One option could be to desig a chalkboard with tcolorbox help.
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{emerald}
\usepackage{tikz}
\usepackage{lipsum}
\usepackage{simpsons}
\usepackage[most]{tcolorbox}
\newtcolorbox{chalk}[1][]{
enhanced,
colback={green!40!black},
colupper=white,
fontupper=\ECFAugie\large,
notitle,
sharp corners,
colframe=brown!70!black,
height=.75\linewidth,
boxrule=2mm,
drop fuzzy shadow,
underlay={\tcbvignette{size=2mm,
inside node=frame, raised color=brown!70!black}},
#1
}
\begin{document}
\begin{chalk}
\lipsum[2]
\end{chalk}
\begin{chalk}[interior style image=blackboard.jpg]
\lipsum[2]
\hfill\Left\Bart
\end{chalk}
\end{document}

The handwritten font was taken from samcarter's answer to I need a beamer theme simulating blackboard presentation
And the background image on second example is an edited version of this blackboard