Latex for cheatsheet with verbatim

gistfile1.txt

\documentclass[10pt,english,landscape]{article}
\usepackage{multicol}
\usepackage{calc}
\usepackage[landscape]{geometry}
\usepackage{color,graphicx,overpic}

\usepackage[T1]{fontenc}
\usepackage[bitstream-charter]{mathdesign}
\usepackage[utf8]{inputenc}
\usepackage{url}
\usepackage{amsfonts}
\usepackage{array,booktabs}
\usepackage{textcomp}
\usepackage[usenames,dvipsnames,table]{xcolor}
\usepackage[most]{tcolorbox}
\usepackage{tabularx}
\usepackage{multirow}
\usepackage{colortbl}
\usepackage{tikz}
\usepackage{environ}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{minted}
\usepackage{listings}
\usemintedstyle{borland}
\usetikzlibrary{calc}
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}
\newsavebox\mybox

\geometry{top=-0.5cm,left=1cm,right=1cm,bottom=1cm}

\pagestyle{empty} % Turn off header and footer

% \renewcommand\rmdefault{phv} % Arial
% \renewcommand\sfdefault{phv} % Arial

% Redefine section commands to use less space
\makeatletter
\renewcommand{\section}{\@startsection{section}{1}{0mm}%
	{-1ex plus -.5ex minus -.2ex}%
	{0.5ex plus .2ex}%x
	{\normalfont\large\bfseries}}
\renewcommand{\subsection}{\@startsection{subsection}{2}{0mm}%
	{-1explus -.5ex minus -.2ex}%
	{0.5ex plus .2ex}%
	{\normalfont\normalsize\bfseries}}
\renewcommand{\subsubsection}{\@startsection{subsubsection}{3}{0mm}%
	{-1ex plus -.5ex minus -.2ex}%
	{1ex plus .2ex}%
	{\normalfont\small\bfseries}}
\makeatother

\setcounter{secnumdepth}{0} % Don't print section numbers
\setlength{\parindent}{0pt}
\setlength{\parskip}{0pt plus 0.5ex}

\definecolor{TableHead}{rgb}{0.353, 0.329, 0.667}
\definecolor{TableRow}{rgb}{0.816, 0.812, 0.902}

\NewEnviron{keys}[4][2]{% <-- Modified by default, 2 columns
	% \begin{center}
		\smallskip
		\begin{tikzpicture}
			\rowcolors{1}{}{TableRow}
			%    \centering
			\node (tbl) [inner sep=0pt] {
				\begin{tabularx}{\linewidth}{*{#1}{X}} % <-- Modified
					\rowcolor{TableHead}
					{\normalsize\textbf{\color{white}{#2}}}\parbox{0pt}{\rule{0pt}{0.3ex+\baselineskip}}
					& {\normalsize\textbf{\color{white}{#3}}}\parbox{0pt}{\rule{0pt}{0.3ex+\baselineskip}}
					& {\normalsize\textbf{\color{white}{#4}}}\parbox{0pt}{\rule{0pt}{0.3ex+\baselineskip}}
					\\
					\BODY
					\arrayrulecolor{TableHead}\specialrule{.17em}{0em}{.2em}
			\end{tabularx}};
			\begin{tabularx}{\textwidth}{*{#1}{X}}
			\rowcolor{TableHead}
			{\normalsize\textbf{\color{white}{#2}}}\parbox{0pt}{\rule{0pt}{0.3ex+\baselineskip}}
			& {\normalsize\textbf{\color{white}{#3}}}\parbox{0pt}{\rule{0pt}{0.3ex+\baselineskip}}
			& {\normalsize\textbf{\color{white}{#4}}}\parbox{0pt}{\rule{0pt}{0.3ex+\baselineskip}}
			\\
			\BODY
			\arrayrulecolor{TableHead}\specialrule{.17em}{0em}{.2em}
			
			\end{tabularx}
			\begin{pgfonlayer}{background}
				\draw[rounded corners=2pt,top color=TableHead,bottom color=TableHead, draw=white]
				($(tbl.north west)-(0,-0.05)$) rectangle ($(tbl.north east)-(0.0,0.15)$);
				\draw[rounded corners=2pt,top color=TableHead,bottom color=TableHead, draw=white]
				($(tbl.south west)-(0.0,-0.11)$) rectangle ($(tbl.south east)-(-0.0,-0.02)$);
			\end{pgfonlayer}
		\end{tikzpicture}
		% \end{center}
}

\begin{document}
	\begin{lrbox}{\mybox}
		\begin{lstlisting}
				#!/bin/bash
				echo "Hello World!!!" 
		\end{lstlisting}
	\end{lrbox}

	\raggedright\
	
	\begin{center}
		\Large{\underline{Emacs Cheatsheet}}
	\end{center}
	
	\footnotesize
	\begin{multicols}{2}
		
		\begin{keys}[3]{Scenario}{Sample Code}{Explanation}
			Control (Ctrl) key  & \texttt{M} & \texttt{C key for your OS} \\
			Alt (Meta) key      & \texttt{M} & \texttt{M Key for your OS} \\
			Shift key           & \texttt{S} & \texttt{M Key for your OS} \\
			Command (Super) key & \texttt{CMD} & \texttt{M Key for your OS} \\
			Function (Fn) key   & \texttt{fn} & \texttt{M Key for your OS} \\
			\usebox\mybox           & \texttt{fn-left / fn-right}  & \texttt{M Key for your OS} \\
		\end{keys}
		
		
	\end{multicols}
	
\end{document}