\tcbuselibrary{skins,breakable}
\newtcbox{\section@box}{tile,before=\noindent,after=,
  fontupper=\normalfont\Large\bfseries,capture=minipage,colback=ForestGreen!80,coltext=white,
  boxsep=0mm,top=4mm,bottom=4mm,left=\oddsidemargin+1in,right=\oddsidemargin+1in,
  spread sidewards,fuzzy halo=1mm with ForestGreen!50!black}

\renewcommand\section{\@startsection{section}{1}{\z@}{\z@}{5mm}{\section@box}}

\newtcolorbox{alertbox}[1][]{breakable,enhanced,
  before skip balanced=2mm,after skip balanced=3mm,
  tile,left=11mm,right=2mm,top=1mm,bottom=1mm,
  colback=white!0,
  sharp corners,
  underlay={%
    \path[fill=OrangeRed!80!black,draw=none] (interior.south west) rectangle node[white]{\Huge\bfseries !} ([xshift=10mm]interior.north west);
  },#1}

\newtcolorbox{codebox}[1][]{breakable,enhanced,
  before skip balanced=2mm,after skip balanced=3mm,
  tile,left=11mm,right=2mm,top=1mm,bottom=1mm,
  colback=white!0,
  sharp corners,
  underlay={%
    \path[fill=black,draw=none] (interior.south west) rectangle node[white]{\huge\bfseries\texttt >\_} ([xshift=10mm]interior.north west);
  },#1}

\newtcolorbox{questionbox}[1][]{breakable,enhanced,
  before skip balanced=2mm,after skip balanced=3mm,
  tile,left=11mm,right=2mm,top=1mm,bottom=1mm,
  colback=white!0,
  sharp corners,
  underlay={%
    \path[fill=MidnightBlue!85!gray,draw=none] (interior.south west) rectangle node[white]{\Huge\bfseries ?} ([xshift=10mm]interior.north west);
  },#1}

\newtcolorbox{morebox}[1][]{breakable,enhanced,
  before skip balanced=2mm,after skip balanced=3mm,
  tile,left=7mm,right=7mm,top=1mm,bottom=1mm,
  colback=white!0,
  sharp corners,
  underlay={%
    \path[fill=ForestGreen!50!white,draw=none] (interior.south west) rectangle node[white]{\Huge\bfseries (} ([xshift=6mm]interior.north west);
    \path[fill=ForestGreen!50!white,draw=none] (interior.south east) rectangle node[white]{\Huge\bfseries )} ([xshift=6mm]interior.north east);
  },#1}
