preamble.tex

\usepackage{tcolorbox}
\usepackage{booktabs}
\usepackage{amsthm}

\newenvironment{note}{\begin{tcolorbox}[colback=blue!5!white,colframe=blue!75!black]}{\end{tcolorbox}}
\newenvironment{notel}{\begin{tcolorbox}[colback=blue!5!white,colframe=blue!75!black]}{\end{tcolorbox}}
\newenvironment{warning}{\begin{tcolorbox}[colback=orange!5!white,colframe=orange]}{\end{tcolorbox}}
\newenvironment{warningl}{\begin{tcolorbox}[colback=orange!5!white,colframe=orange]}{\end{tcolorbox}}
\newenvironment{tip}{\begin{tcolorbox}[colback=green!5!white,colframe=green]}{\end{tcolorbox}}

\makeatletter
\def\thm@space@setup{%
  \thm@preskip=8pt plus 2pt minus 4pt
  \thm@postskip=\thm@preskip
}
\makeatother